• Minimizing the tracking error of cardinality constrained portfolios
    P Mutunge, D Haugland
    Computers & Operations Research 2018 ;Volum 90. s. 33-41
  • Surrogate-based model parameter optimization based on gas explosion experimental data
    AL Both, H Hisken, JJ Rückmann, T Steihaug
    Engineering Optimization, DOI: 10.1080/0305215X.2018.1450399
  • Area Protection in Adversarial Path-finding Scenarios with Multiple Mobile Agents on Graphs - A Theoretical and Experimental Study of Strategies for Defense Coordination
    M Ivanova, P Surynek, K Hirayama
    Proceedings of the 10th International Conference on Agents and Artificial Intelligence (ICAART), 184-191
  • On measures, pricing and sharing of risk
    SD Flåm
    Revista Investigacion National 39, 3
  • Blocks of coordinates, stochastic programming, and markets
    SD Flåm
    Computational Management Science, DOI: 10.1007/s10287-018-0303-3
  • A parametrized stock-recruitment relationship derived from a slow-fast population dynamic model
    U Schaarschmidt, T Steihaug, S Subbey
    Mathematics and Computers in Simulation 145, 171-185
  • A note on strict complementarity for the doubly nonnegative cone
    B Jargalsaikhan, JJ Rückmann
    Optimization DOI: 10.1080/02331934.2018.1477943
  • MPCC: On necessary conditions for the strong stability of C-stationary points 
    D Hernandez Escobar, JJ Rückmann

  • Generation of K-convex test problems in variable ordering settings
    G Bouza Allende, D Hernandez Escobar, JJ Rückmann
    Investigacion Operacional 39 (3)

  • On vector generalized semi-infinite programming
    F Guerra Vazquez, LA Hernandez Rebollar, JJ Rückmann
    Investigacion Operacional 39 (3)

  • Variational Analysis and Optimization Theory (special issue)
    G Bouza Allende, JJ Rückmann, C Tammer (guest-editors)
    Investigacion Operacional 39 (3) 

  • Approximating cube roots of integers after Heron’s Metrica III.20
    Steihaug, T. and Rogers, D.
    NORMAT (Nordic Mathematical Journal), 61(2)

  • A review of termination rules of an inexact primal-dual interior point method for linear programming problems
    Baryamureeba, V., Steihaug, T., and El Ghami, M. 
    Revista de Investigacion Operacional, Vol. 39, No. 3



  • Evaluating the importance of randomization in adaptive large neighborhood search
    A Hemmati, LM Hvattum
    International Transactions in Operational Research 24 (5), 929-942  
  • Response surfaces for advanced consequence models: Two approaches
    AL Braatz, H Hisken
    Journal of Loss Prevention in the Process Industries 49, 683-699
  • Reaching Cournot-Walras Equilibrium
    SD Flåm, K Gramstad
    ESAIM: Proceedings and Surveys 57, 12-22
  • Order books, markets and convex analysis
    SD Flåm
    Optimization 66 (8), 1413-1424
  • A model for optimal fleet composition of vessels for offshore wind farm maintenance,
    A Gutierrez-Alcoba, G Ortega, EMT Hendrix, EE Halvorsen-Weare, D Haugland
    Procedia Computer Science 108, 1512-1521
  • Point-based neighborhoods for sharp calmness constants in linear programming
    MJ Canovas, J Parra, JJ Rückmann, FJ Toledo 
    Set-Valued and Variational Analysis 25 (4), 757-772
  • On duality in multiobjective semi-infinite optimization 
    F Guerra Vazquez, JJ Rückmann 
    Optimization 66 (8), 1237-1249

  • A tutorial note on a convexification procedure in non-convex semi-infinite programming optimization 
    JJ Rückmann
    Investigacion Operacional 38 (4), 309-319

  • ISORA 2015 (special issue)
    JE Martinez Legaz, E Ocana Anaya, JJ Rückmann (guest-editors) 
    Optimization 66 (8) 

  • A new parametric kernel function with trigonometric barrier term for convex quadratic symmetric cone optimization
    Wang, G.Q, El Ghami, M and Steihaug, T
    Applied Analysis and Optimization

  • A New Parametric Kernel Function Yielding the Best Known Iteration Bonds of Interior Point Methods for the Cartesian P∗(κ)-SCLCP 
    Cai, X.Z., Wang, D.Z., El Ghami, M; Steihaug, T., and Wang, G. 
    Pacific Journal of Optimization 



  • An iterative two-phase hybrid matheuristic for a multi-product short sea inventory-routing problem
    A Hemmati, LM Hvattum, M Christiansen, G Laporte
    European Journal of Operational Research 252 (3), 775-788 
  • Response surfaces for advanced consequence models: two approaches
    AL Braatz, H Hisken
    11th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (XI ISHPMIE)
  • Surrogate-based optimisation of model parameters for the improved modelling of industrial-scale gas explosions
    AL Braatz, H Hisken, JJ Rückmann
    5th International Conference on Engineering Optimization (EngOpt 2016)
  • The Shared Broadcast Tree Problem and MST
    M Ivanova
    Electronic Notes in Discrete Mathematics 55, 5-8
  • Shared Multicast Trees in Ad Hoc Wireless Networks
    M Ivanova
    Combinatorial Optimization - 4th International Symposium (ISCO), 273-284
  • Borch's theorem, equal margins, and efficient allocation
    SD Flåm
    Insurance, Mathematics & Economics 70, 162-168
  • Noncooperative games, coupling constraints, and partial efficiency
    SD Flåm
    Economic Theory Bulletin 4 (2), 213-229
  • Monotonicity and market equilibrium
    SD Flåm
    Set-Valued and Variational Analysis 24 (3), 403-421
  • Bilateral exchange and competitive equilibrium
    SD Flåm
    Set-Valued and Variational Analysis 24 (1), 1-11
  • Pooling Problems with Polynomial-Time Algorithms
    D Haugland, EML Hendrix
    Journal of Optimization Theory and Applications 170 (2), 591-615
  • The computational complexity of the pooling problem
    D Haugland
    Journal of Global Optimization, 64 (2), 199-215
  • A continuously differentiable turbine layout optimization model for offshore wind farms
    A Klein
    Energy Procedia, 94, 497-503
  • Tight semi-model-free bounds on (bilateral) CVA 
    J Helmers, JJ Rückmann, R Werner 
    In: K Glau et al. (editors), Innovations in Derivatives Markets, Springer, New York, 83-101

  • A tutorial note on multiobjective semi-infinite programming
    JJ Rückmann 
    Investigacion Operacional 37 (3), 216-225

  • On the final steps of Newton and higher order methods
    Steihaug, T., and Suleiman, S. 
    Optimization Letters, Vol. 10(2), pp 401-416



  • An effective heuristic for solving a combined cargo and inventory routing problem in tramp shipping
    A Hemmati, M Stålhane, LM Hvattum, H Andersson
    Computers & Operations Research 64, 274-282
  • Control of adsorption chillers by a gradient descent method for optimal cycle time allocation
    U Bau, AL Braatz, F Lanzerath, M Herty, A Bardow
    International Journal of Refrigeration 56, 52-64
  • Optimization models and methods for maritime cargo and inventory routing problems
    A Hemmati
  • Risk Measures, Convexity, and Max-Min Shortfalls
    SD Flåm
    Journal of Convex Analysis 22 (3), 603-626
  • Liability Insurance and Choice of Cars: A Large Game Approach
    SD Flåm, EG Wolfstetter
    Journal of Public Economic Theory 17 (6), 943-963
  • Ragnar Frisch and interior-point methods
    O Bjerkholt, SD Flåm
    Optimization Letters 9 (6), 1053-1061
  • Optimal intake and routing of floating oil rigs in the North Sea
    D Haugland, BP Tjøstheim
    In KG Murty (ed.): Case Studies in Operations Research: Applications of Optimal Decision Making, International Series in Operations Research & Management Science, 212, 315-336
  • On a pooling problem with fixed network size
    D Haugland, EML Hendrix
    Lecture Notes in Computer Science, 9335, 328-342
  • An Integer Programming Model for Branching Cable Layouts in Offshore Wind Farms
    A Klein, D Haugland, J Bauer, M Mommer
    Advances in Intelligent Systems and Computing, 359 (1), 27-36
  • Derivative-free optimization for population dynamic models
    U Schaarschmidt, T Steihaug, S Subbey
    In HA Le Thi, T Pham Dinh, NT Nguyen (eds.): Modelling, Computation and Optimization in Information Systems and Management Science, 391-402, Springer, Cham
  • Multiobjective semi-infinite optimization: convexification and properly efficient points 
    F Guerra Vazquez, JJ Rückmann
    In: GO Tost et al. (editors), Analysis, Modelling, Optimization, and Numerical Techniques, Springer, New York, 327-347



  • Benchmark suite for industrial and tramp ship routing and scheduling problems
    A Hemmati, LM Hvattum, K Fagerholt, I Norstad
    INFOR: Information Systems and Operational Research 52 (1), 28-38 
  • A simulated annealing algorithm for routing problems with fuzzy constrains
    MHF Zarandi, A Hemmati, S Davari, IB Turksen
    Journal of Intelligent & Fuzzy Systems 26 (6), 2649-2660  
  • Adversarial Cooperative Path-Finding: Complexity and Algorithms
    M Ivanova, P Surynek
    26th IEEE International Conference on Tools with Artificial Intelligence (ICTAI), 75-82
  • Gradient differences and bilateral barters
    SD Flåm, O Godal, A Soubeyran
    Optimization 63 (5), 693-712
  • A cost minimization heuristic for the pooling problem
    M Alfaki, D Haugland
    Annals of Operations Research, 222 (1), 73-87
  • Modeling and forecasting stock recruitment: Current and future perspectives
    S Subbey, JA Devine, U Schaarschmidt, RDM Nash
    ICES Journal of Marine Science 71 (8), 2307-2322
  • On the local representation of piecewise smooth equations as a Lipschitz manifold
    D Dorsch, HT Jongen, JJ Rückmann, V Shikhman 
    J. Math. Anal. Appl. 411, 916-930

  • On proper efficiency in multiobjective semi-infinite optimization 
    F Guerra Vazquez, JJ Rückmann 
    In: H Xu et al. (editors), Optimization and Control Techniques and Applications, Springer, New York, 115-135

  • Algorithm for forming derivative-free optimal methods
    Khattri, SK., and Steihaug, T.
    Numerical Algorithms; Vol. 65(4) pp. 809-824

  • A Subclass of Generating Set Search with Convergence to Second-Order Stationary Points
    Abramson, M., Frimannslund, L., and Steihaug, T.
    Optimization Methods and Software;Vol. 29(5)pp 900-918


  • Capacitated location-routing problem with time windows under uncertainty
    MHF Zarandi, A Hemmati, S Davari, IB Turksen
    Knowledge-Based Systems 37, 480-489    
  • Adversarial Cooperative Path-Finding: A First View
    M Ivanova, P Surynek
    Late-Breaking Developments in the Field of Artificial Intelligence, 53-55
  • Optimization methods for pipeline transportation of natural gas with variable specific gravity and compressibility
    C Borraz-Sànchez, D Haugland
    TOP - an official journal of the Spanish Society of Statistics and Operations Research, 21 (3), 524-541
  • Strong formulations for the pooling problem
    M Alfaki, D Haugland
    Journal of Global Optimization, 56 (3), 897-916
  • A multi-commodity flow formulation for the generalized pooling problem
    M Alfaki, D Haugland
    Journal of Global Optimization, 56 (3), 917-937
  • MIDACO on MINLP Space Applications 
    S Erb, M Gerdts, S Kemble, JJ Rückmann, M Schlüter 
    Advances in Space Research 51 (7), 1116-1131

  • A note on logarithmic smoothing in semi-infinite optimization under reduction approach 
    F Guerra Vazquez, JJ Rückmann 
    Croatian OR Review 4, 19-30

  • Rate of convergence of higher order methods
    Steihaug, T., and Suleiman, S.
    Applied Numerical Mathematics. Vol. 67, pp. 230–242

  • Graph models and their efficient implementation for sparse Jacobian matrix determination
    Hossain, S., and Steihaug, T.
    Discrete Applied Mathematics 2013; Vol. 161(12) pp. 1747-1754

  • Structure in Optimization: Factorable Programming and Functions
    Hascoêt, L., Hossain, S., and Steihaug, T.
    In: Computer and Information Sciences III.  pp. 449-458, Springer

  • Structured computation in optimization and Algorithmic Differentiation
    Hascoêt, L., Hossain, S., and Steihaug, T.
    ACM Communications in Computer Algebra; Vol. 46(3) Suppl. Issue: 181 pp. 94-95

  • Solving trust-region subproblem augmented with linear inequality constraints
    Bergmann, Ø., and Steihaug, T.
    Optimization Methods and Software; Vol. 28(1) pp. 26-36

  • Computational and Sensitivity Aspects of Eigenvalue-Based Methods for the Large-Scale Trust-Region Subproblem
    Rojas, M., Fotland, B., and Steihaug, T. 
    Optimization Methods and Software; Vol. 28(3) pp. 564-580

  • Global convergence and the Powell singular function
    Steihaug, T., and Suleiman, S.
    Global Optimization; Vol. 56(3) pp. 845-853

  • Optimal Direct Determination of Sparse Jacobian Matrices 
    Hossain, S., and Steihaug, T.
    Optimization Methods and Software; Vol. 28(6) pp.1218-1232

  • Sparse matrix computations with application to solving system of nonlinear equations
    Hossain, S., and Steihaug, T. 
    Wiley Interdisciplinary Reviews: Computational Statistics; Vol. 5(5) pp. 372-386

  • Adaptive Curve Tailoring
    Steihaug, T., and Wang, W.  
    In: Information Sciences and Systems pp.3-13, Springer




  • Dual decomposition for computational optimization of minimum-power shared broadcast tree in wireless networks
    D Yuan, D Haugland
    IEEE Transactions on Mobile Computing, 11 (12), 2008-2019
  • Computing the Optimal Layout of a Wind Farm.
    JK Haugland, D Haugland
    In Norsk informatikkonferanse (NIK 2012), ISSN 1892-0713, Akademika forlag
  • Parallel algorithms for the maximum flow problem with minimum lot sizes
    M Eleyat, D Haugland, ML Hetland, L Natvig
    Operations Research Proceedings 2011, 83-88, ISBN 978-3-642-29209-5, Springer
  • SIP: critical value functions have  finite modulus of non-convexity 
    D Dorsch, F Guerra Vazquez, H Günzel, HT Jongen, JJ Rückmann
    Mathematical Programming 136 (1), 133-154

  • Parametric Optimization and Related Topics X (special issue)
    JJ Rückmann, O Stein (guest-editors) 
    Optimization 61 (6) 

  • A numerical study of MIDACO on 100 MINLP benchmarks 
    M Gerdts, JJ Rückmann, M Schlüter 
    Optimization 61 (7), 873-900

  • On saddle points in nonconvex semi-infinite programming
    F Guerra Vazquez, JJ Rückmann, R Werner 
    J. Global Optimization 54 (3), 433-447

  • Parametric Optimization and Related Topics (special issue)
    JJ Rückmann, O Stein (guest-editors) 
    Mathematical Programming 136 (1) 

  • Semi-infinite programming: strong stability implies EMFCQ 
    D Dorsch, F Guerra Vazquez, H Günzel, JJ Rückmann 
    J. Convex Analysis 19 (4), 999-1008

  • On diagonally structured problems in unconstrained optimization using an inexact super Halley method
    Gundersen, G. and Steihaug, T.
    Journal of Computational and Applied Mathematics; Vol. 236(15) pp. 3685-3695

  • Interior-point methods for linear optimization based on a kernel function with a trigonometric barrier term
    El Ghami, M., Guennoun, Z, Bouali, S., and Steihaug, T.
    Journal of Computational and Applied Mathematics; Vol. 236(15) pp. 3613-3623

  • Sparsity in higher order methods for unconstrained optimization
    Gundersen, G., and Steihaug, T.
    Optimization Methods and Software, Vol. 27(2), pp.275-294


  • The multi-depot capacitated location-routing problem with fuzzy travel times
    MHF Zarandi, A Hemmati, S Davari
    Expert Systems with Applications 38 (8), 10075-10084    
  • Maximal covering location problem (MCLP) with fuzzy travel times
    S Davari, MHF Zarandi, A Hemmati
    Expert Systems with Applications 38 (12), 14535-14541  
  • Minimizing fuel cost in gas transmission networks by dynamic programming and adaptive discretization
    C Borraz-Sànchez, D Haugland
    Computers & Industrial Engineering, 61, 364-372
  • Local search heuristics for the probabilistic dial-a-ride problem
    SC Ho, D Haugland
    OR Spectrum, 33 (4), 961-988
  • The maximum flow problem with minimum lot sizes
    D Haugland, M Eleyat, ML Hetland
    Lecture Notes in Computer Science, 6971, 170-182
  • Semi-infinite programming
    F Guerra Vazquez, JJ Rückmann 
    In: J Cochran et al. (editors), Encyclopedia of Operations Research and Management
    Science, Wiley, Hoboken, 4770-4479
  • A Class of Methods Combining L-BFGS and Truncated Newton
    Frimannslund, L., and Steihaug, T.
    In: Computer and Information Sciences II, pp. 565-570, Springer 

  • On a New Method for Derivative Free Optimization
    Frimannslund, L., and Steihaug, T.
    International Journal On Advances in Software; Vol. 4(3-4) pp. 244-255


  • The variable radius covering problem with fuzzy travel times
    S Davari, MHF Zarandi, A Hemmati, IB Turksen
    Fuzzy Systems (FUZZ), 2010 IEEE International Conference on, 1-6    
  • Fuzzy time series based on defining interval length with Imperialist Competitive Algorithm
    MHF Zarandi, A Molladavoudi, A Hemmati
    Fuzzy Information Processing Society (NAFIPS), 2010 Annual Meeting of the North American    
  • Fuzzy Clustering for Initialization of Simulated Annealing Algorithm to Solve a Capacitated Vehicle Routing Problem
    MHF Zarandi, S Davari, A Hemmati
    Proceedings of the 2010 International Conference on Industrial Engineering and Operations Management 
  • Feasibility testing for dial-a-ride problems
    D Haugland, SC Ho
    Lecture Notes in Computer Science, 6124, 170-179
  • An overview of models and solution methods for pooling problems
    D Haugland
    In E Bjørndal, M Bjørndal, PM Pardalos, M Rönnqvist (eds.): Energy, Natural Resources and Environmental Economics, 459-469, ISBN 978-3-642-12066-4, Springer
  • On interior logarithmic smoothing and strongly stable stationary points 
    HT Jongen, JJ Rückmann 
    SIAM J. Optimization 20 (5), 2137-2156

  • Joint routing, link scheduling and power control for wireless multi-hop networks for CDMA/TDMA systems
    JJ Rückmann, M Sanchez Meraz, C Sosa Paz
    Cientifica 14 (4), 165-172

  • STA, The Space Trajectory Analysis Project - European Space Agency (ESA)
    G Ortega, S Erb, JJ Rückmann et al.
    Proceedings of the 4th International Conference on Astrodynamics Tools and Techniques, Madrid, Spain

  • Regression analysis for clusters in gene-environment networks based on ellipsoidal calculus and optimization
    E Kropat, JJ Rückmann, GW Weber 
    Dynamics of Continuous, Discrete and Impulsive Systems 17 (5), 639-657

  • A generic primal-dual interior-point method for semidefinite optimization based on a new class of kernel functions
    El Ghami, M., Roos, C., and Steihaug, T.
    Optimization Methods and Software; Vol. 25(3)  387-403 

  • On large-scale unconstrained optimization problems and higher order methods
    Gundersen, G. and Steihaug,T.
    Optimization Methods and Software; Vol. 25(3) s. 227-358

  • Kernel-function Based Primal-Dual Algorithms for P*(k) Linear Complementarity Problems
    El Ghami, M., Steihaug, T.
    Reserche operationelle; Vol. 44(3) p. 185-205