On a Technique for Finding Running Tracks of Specific Length in a Road Network. - David Willems; Oliver Zehner; Stefan Ruzika (OR, 2017)

Shortest Paths with Shortest Detours - A Biobjective Routing Problem. - Carolin Torchiani; Jan Ohst; David Willems; Stefan Ruzika (J. Optim. Theory Appl., 2017)

A general approximation method for bicriteria minimization problems. - Pascal Halffmann; Stefan Ruzika; Clemens Thielen; David Willems (Theor. Comput. Sci., 2017)

On the rectangular knapsack problem: approximation of a specific quadratic knapsack problem. - Britta Schulze; Michael Stiglmayr; Luís Paquete; Carlos M. Fonseca; David Willems; Stefan Ruzika (Math. Methods Oper. Res., 2020)