ReVelle, C.S.

solution heuristic problem table research tabu search value european journal facility search journal demand nodes interchange heuristic heuristic concentration sub-optimal solutions column second model concentration demand interchange number p-median ilp -2 combinatorial revelle data sets rosing branch cplex comparison result european metaheuristic model ilp b &b seconds p-median problem method sub-optimal glover 100 problems table 2 integer fraction programming study operation interchange heuristics rushton g detail integer programming heuristic methods optimization distance combinatorial space n 100 combinatorial optimization orsa journal network objective function 50 times series table 1 hakimi location graph instance paper densham vertex t &b heuristic development data sets rsc rolland pmedian problems papers vertex substitution heuristic metaheuristic tabu search procedure hansen optimality