Two-phases Method and Branch and Bound Procedures to Solve the Bi-objective Knapsack Problem. - M. Visée; Jacques Teghem; Marc Pirlot; Ekunda L. Ulungu (J. Glob. Optim., 1998)

Efficiency of interactive multi-objective simulated annealing through a case study. - Ekunda L. Ulungu; Jacques Teghem; Ch. Ost (J. Oper. Res. Soc., 1998)

An interactive heuristic method for multi-objective combinatorial optimization. - Jacques Teghem; Daniel Tuyttens; Ekunda L. Ulungu (Comput. Oper. Res., 2000)