2025

• Peng, Jianwen; Tan, Tao; Köbis, Elisabeth Anna Sophia; Zhang, Xue-Qing. (2025) A sufficient descent Polak-Ribière-Polyak type nonlinear conjugate gradient method for multiobjective optimization problems. Journal of Nonlinear and Convex Analysis
  Article in business/trade/industry journal
• Peng, J.W.; Tan, T.; Köbis, Elisabeth Anna Sophia; Zhang, X.Q.. (2025) A SUFFICIENT DESCENT POLAK-RIBIERE-POLYAK TYPE NONLINEAR CONJUGATE GRADIENT METHOD FOR MULTIOBJECTIVE OPTIMIZATION PROBLEMS. Journal of Nonlinear and Convex Analysis
  Academic article
• Ait Mansour, Mohamed; Lahrache, Jafaar; Köbis, Elisabeth Anna Sophia; Sessa, Valentina; Tammer, Christiane. (2025) Preface Special Issue Dedicated to the Autumn School ASEM23 Devoted to Equilibrium Problems and Minimax Inequalities. Applied Set-Valued Analysis and Optimization
  Editorial
• Peng, Jian-Wen; Sun, Hua; Köbis, Elisabeth Anna Sophia. (2025) Nonmonotone Proximal Gradient Method for Composite Multiobjective Optimization Problems. Journal of Optimization Theory and Applications
  Article in business/trade/industry journal
• Duy, Nguyen Huynh Vu; Nguyen Van, Hung; Köbis, Elisabeth Anna Sophia. (2025) CONVERGENCES OF THE SOLUTION SETS FOR STRONG VECTOR QUASI-EQUILIBRIUM PROBLEMS. Journal of Nonlinear and Convex Analysis
  Academic article

2024

• Ali, Muhammad; Sitthiwirattham, Thanin; Köbis, Elisabeth Anna Sophia; Hanif, Asma. (2024) Hermite–Hadamard–Mercer Inequalities Associated with Twice-Differentiable Functions with Applications. Axioms
  Academic article
• Liu, Luyu; Chen, Jiawei; Köbis, Elisabeth Anna Sophia; Lv, Yibing; Ou, Xiaoqing. (2024) Second-order Karush/Kuhn–Tucker conditions and duality for constrained multiobjective optimization problems. Optimization
  Academic article
• Vu, Trung Hieu; Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur; Schmölling, Paul Hugo. (2024) Unboundedness of the images of set-valued mappings having closed graphs: application to vector optimization. Journal of Global Optimization
  Academic article
• Hu, Lingli; Fang, Donghui; Köbis, Elisabeth Anna Sophia. (2024) Local optimality conditions and local saddle point theorems for nonconvex robust programming. Journal of Nonlinear and Variational Analysis
  Academic article

2023

• Chen, Jiawei; Yang, Ruixi; Köbis, Elisabeth Anna Sophia; Ou, Xiaoqing. (2023) Convexificators for nonconvex multiobjective optimization problems with uncertain data: robust optimality and duality. Optimization
  Academic article
• Chen, Jiawei; Yang, Ruixi; Köbis, Elisabeth Anna Sophia; Zhang, Tao. (2023) Robust duality and saddle point characterizations for nonconvex multiobjective optimization with data uncertainty. Journal of Nonlinear and Convex Analysis
  Academic article
• Elster, Rosalind; Günther, Christian; Khan, Akhtar; Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur. (2023) Editorial: “International Conference on Variational Analysis and Nonsmooth Optimization” In honor of the 65th birthday of Christiane Tammer (Martin Luther University Halle-Wittenberg). Journal of Applied and Numerical Optimization
  Editorial
• Köbis, Elisabeth Anna Sophia; Tammer, Christiane. (2023) Optimality conditions in optimization under uncertainty. Journal of Nonlinear and Variational Analysis
  Academic article
• Günther, Christian; Köbis, Elisabeth Anna Sophia; Schmoelling, Paul; Tammer, Christiane. (2023) Vectorial penalisation in vector optimisation in real linear-topological spaces. Journal of Nonlinear and Variational Analysis
  Academic article
• Ali, Muhammad Amir; Köbis, Elisabeth Anna Sophia. (2023) Some new Q-Hermite-Hadamard-Mercer Inequalities And Related Estimates in Quantum Calculus. Journal of Nonlinear and Variational Analysis
  Academic article
• Duy, Nguyen Huynh Vu; Nguyen Van, Hung; Köbis, Elisabeth Anna Sophia; Yao, Jen-Chih. (2023) Levitin-Polyak well-posedness for symmetric weak vector quasi-equilibrium problems. Journal of Nonlinear and Convex Analysis
  Academic article
• Ali, Muhammad Amir; Budak, Hüseyin Budak; Köbis, Elisabeth Anna Sophia. (2023) Some new and general versions of q-Hermite-Hadamard-Mercer inequalities. Filomat
  Academic article
• Zhou, Zhiang; Huang, Ming; Köbis, Elisabeth Anna Sophia. (2023) Globally proper efficiency of set optimization problems based on the certainly set less order relation. Applicable Analysis
  Academic article

2022

• Köbis, Elisabeth Anna Sophia; Sarychev, Andrey; Tchemisova, Tatiana; Wilhelm-Weber, Gerhard. (2022) Editorial: International Conference "Dynamical Control and Optimization". Optimization
  Editorial
• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur; Tammer, Christiane. (2022) A FIRST BIBLIOGRAPHY ON SET AND VECTOR OPTIMIZATION PROBLEMS WITH RESPECT TO VARIABLE DOMINATION STRUCTURES. Journal of Nonlinear and Variational Analysis
  Academic literature review
• Gemayqzel, Bouza Allende; Köbis, Elisabeth Anna Sophia; Tammer, Christiane; Yao, Jen-Chih. (2022) Editorial: A Special Issue on the theory and numerical methods for vector optimization problems with respect to variable domination structures . Journal of Nonlinear and Variational Analysis
  Abstract
• Köbis, Elisabeth Anna Sophia; Tammer, Christiane. (2022) An existence principle of Takahashi's type for vector optimization problems and applications. Journal of Nonlinear and Convex Analysis
  Academic article
• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur. (2022) Approximate elements for set optimization problems with respect to variable domination structures. Journal of Nonlinear and Variational Analysis
  Academic article

2021

• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur. (2021) The Weighted Set Relation: Characterizations in the Convex Case. Journal of Nonlinear and Variational Analysis
  Academic article
• Köbis, Elisabeth Anna Sophia; Li, Jinlu; Petruşel, Adrian; Yao, Jen-Chih. (2021) Recent development in nonlinear and variational analysis and optimization. Optimization
  Editorial
• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur. (2021) Characterizing the upper set relation by general functionals. Applied Set-Valued Analysis and Optimization
  Academic article
• Gutiérrez, César; Huerga, Lidia; Köbis, Elisabeth Anna Sophia; Tammer, Christiane. (2021) A scalarization scheme for binary relations with applications to set-valued and robust optimization. Journal of Global Optimization
  Academic article

2020

• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur; Qin, Xiaolong. (2020) An Inequality Approach to Approximate Solutions of Set Optimization Problems in Real Linear Spaces. Mathematics
  Academic article
• Ceng, Lu-Chuan; Köbis, Elisabeth Anna Sophia; Zhao, Xiaopeng. (2020) On General Implicit Hybrid Iteration Method for Triple Hierarchical Variational Inequalities with Hierarchical Variational Inequality Constraints. Optimization
  Academic article
• Hung, Nguyen Van; Dai, Le Xuan; Köbis, Elisabeth Anna Sophia; Yao, Jen-Chih. (2020) The generic stability of solutions for vector quasi-equilibrium problems on Hadamard manifolds . Journal of Nonlinear and Variational Analysis
  Academic article

2019

• Günther, Christian; Köbis, Elisabeth Anna Sophia; Popovici, Nicolae. (2019) On strictly minimal elements w.r.t. preorder relations in set-valued optimization. Applied Set-Valued Analysis and Optimization
  Academic article
• Günther, Christian; Köbis, Elisabeth Anna Sophia; Popovici, Nicolae. (2019) Computing Minimal Elements Of Finite Families of Sets w.r.t. Preorder Relations in Set-Valued Optimization. Applied Set-Valued Analysis and Optimization
  Academic article
• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur; Qin, Xiaolong. (2019) Nonlinear Separation Approach to Inverse Variational Inequalities in Real Linear Spaces. Journal of Optimization Theory and Applications
  Academic article
• Ansari, Qamrul Hasan; Köbis, Elisabeth Anna Sophia; Sharma, Pradeep Kumar. (2019) Characterizations of Multiobjective Robustness via Oriented Distance Function. Journal of Optimization Theory and Applications
  Academic article
• Nguyen Van, Hung; Tam, Vo Minh; Köbis, Elisabeth Anna Sophia; Yao, Jen-Chih. (2019) Existence of Solutions and Algorithm for Generalized Vector Quasi-complementarity Problems with Application to Traffic Network Problems. Journal of Nonlinear and Convex Analysis
  Academic article
• Nguyen Van, Hung; Köbis, Elisabeth Anna Sophia; Tam, Vo Minh. (2019) Existence Conditions for Set-Valued Vector Quasi-Equilibrium Problems on Hadamard Manifolds with Variable Domination Structure and Applications. Journal of Nonlinear and Convex Analysis
  Academic article
• Chen, Jiawei; Ju, Xingxing; Köbis, Elisabeth Anna Sophia; Liou, Yeong-Cheng. (2019) Tikhonov Type Regularization Methods for Inverse Mixed Variational Inequalities. Optimization
  Academic article
• Nguyen Van, Hung; Köbis, Elisabeth Anna Sophia; Tam, Vo Minh. (2019) Existence of Solutions and Iterative Algorithms for Weak Vector Quasi-Equilibrium Problems. Journal of Nonlinear and Convex Analysis
  Academic article
• Chen, Jiawei; Köbis, Elisabeth Anna Sophia; Yao, Jen-Chih. (2019) Optimality Conditions and Duality for Robust Nonsmooth Multiobjective Optimization Problems with Constraints. Journal of Optimization Theory and Applications
  Academic article
• Köbis, Elisabeth Anna Sophia; Le, Thanh Tam; Tammer, Christiane; Yao, Jen-Chih. (2019) Necessary Conditions for Solutions of Set Optimization Problems with Respect to Variable Domination Structures. Pure and Applied Functional Analysis
  Academic article
• Hebestreit, Niklas; Khan, Akhtar; Köbis, Elisabeth Anna Sophia; Tammer, Christiane. (2019) Existence Theorems and Regularization Methods for Non-coercive Vector Variational and Vector Quasi-Variational Inequalities. Journal of Nonlinear and Convex Analysis
  Academic article
• Khan, Akhtar; Köbis, Elisabeth Anna Sophia; Tammer, Christiane. (2019) Variational Analysis and Set Optimization: Developments and Applications in Decision Making. CRC Press CRC Press
  Academic anthology/Conference proceedings

2018

• Ansari, Qamrul Hasan; Köbis, Elisabeth Anna Sophia; Yao, Jen-Chih. (2018) Vector Variational Inequalities and Vector Optimization. Theory and Applications. Springer Springer
  Academic monograph
• Chen, Jiawei; Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur; Yao, Jen-Chih. (2018) Image Space Analysis for Constrained Inverse Vector Variational Inequalities via Multiobjective Optimization. Journal of Optimization Theory and Applications
  Academic article
• Köbis, Elisabeth Anna Sophia; Le, Thanh Tam; Tammer, Christiane. (2018) A Generalized Scalarization Method in Set Optimization with Respect to Variable Domination Structures. Vietnam Journal of Mathematics
  Academic article
• Köbis, Elisabeth Anna Sophia; Köbis, Markus Arthur. (2018) Overshoot Optimized Newmark-Type Methods. Investigacion Operacional
  Academic article
• Hebestreit, Niklas; Köbis, Elisabeth Anna Sophia. (2018) Representation of Set Relations in Real Linear Spaces. Journal of Nonlinear and Convex Analysis
  Academic article
• Sharma, Pradeep Kumar; Köbis, Elisabeth Anna Sophia; Ansari, Qamrul Hasan. (2018) Characterizations of Set Relations with Respect to Variable Domination Structures via Oriented Distance Function. Optimization
  Academic article
• Köbis, Elisabeth Anna Sophia; Le, Thanh Tam. (2018) Numerical Procedures for Obtaining Strong, Strict and Ideal Minimal Solutions of Set Optimization Problems. Applied Analysis and Optimization
  Academic article
• Fang, Donghui; Köbis, Elisabeth Anna Sophia; Zhao, Xiaopeng. (2018) Zero Duality Gap Property for Convex Composite Optimization Problems. Journal of Nonlinear and Convex Analysis
  Academic article

2017

• Köbis, Elisabeth Anna Sophia; Le, Thanh Tam; Tammer, Christiane; Yao, Jen-Chih. (2017) A New Scalarizing Functional in Set Optimization with Respect to Variable Domination Structures. Applied Analysis and Optimization
  Academic article
• Gutiérrez, César; Huerga, Lidia; Köbis, Elisabeth Anna Sophia; Tammer, Christiane. (2017) Approximate Solutions of Set-Valued Optimization Problems Using Set-Criteria. Applied Analysis and Optimization
  Academic article
• Köbis, Elisabeth Anna Sophia. (2017) Set Optimization by Means of Variable Order Relations. Optimization
  Academic article
• Köbis, Elisabeth Anna Sophia. (2017) Variable Ordering Structures in Set Optimization. Journal of Nonlinear and Convex Analysis
  Academic article
• Köbis, Elisabeth Anna Sophia. (2017) Robust Approaches to Uncertain Optimization. Boletín de Estadística e Investigacíon Operativa
  Academic article