1. Submodular functions and convexity
2. G. L. Nemhauser , L. A. Wolsey and M. L. Fisher . An analysis of approximations for maximizing submodular set functions - I . Mathematical Programming , 1978 , 14(1): 265--294. G. L. Nemhauser, L. A. Wolsey and M. L. Fisher. An analysis of approximations for maximizing submodular set functions - I. Mathematical Programming, 1978, 14(1): 265--294.
3. Non-monotone submodular maximization under matroid and knapsack constraints
4. T. Friedrich , F. Neumann: Maximizing Submodular functions under matroid vonstraints by evolutionary algorithms. Evolutionary Computation 23(4) , MIT Press , 543--558, 2015 . T. Friedrich, F. Neumann: Maximizing Submodular functions under matroid vonstraints by evolutionary algorithms. Evolutionary Computation 23(4), MIT Press, 543--558, 2015.
5. Maximizing the spread of influence through a social network