Michel X. Goemans, Nicholas J. A. Harvey, Satoru Iwata, Vahab S. Mirrokni. Approximating submodular functions everywhere. In Claire Mathieu, editor, Proceedings of the Twentieth Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2009, New York, NY, USA, January 4-6, 2009. pages 535-544, SIAM, 2009. [doi]
Abstract is missing.