1. Facets of the knapsack polytope;Balas;Math. Programming,1975
2. On determining whether a valid inequality is facet defining;Balas,1990
3. Problemas de knapsack 0–1 con una restriccion addicional;Barcelo;Qüestiió,1988
4. Special facilities in a general mathematical programming system for nonconvex problems using ordered sets of variables;Beale,1970
5. Polyhedral results for the precedence-constrained knapsack problem;Boyd,1990