An analysis of approximations for maximizing submodular set functions—I[J] . G. L. Nemhauser,L. A. Wolsey,M. L. Fisher.Mathematical Programming . 1978 (1)
An analysis of approximations for maximizing submodular set functions—I[J] . G. L. Nemhauser,L. A. Wolsey,M. L. Fisher.Mathematical Programming . 1978 (1)