%% -*-BibTeX-*- @Article{NemhauserVance1994, author = "G. L. Nemhauser and P. H. Vance", title = "Lifted cover facets of the 0-1 knapsack polytope with {GUB} constraints", journal = "Operations Research Letters", volume = "16", pages = "255--263", year = "1994", language = "English", }