Michel X. Goemans, Neil Olver, Thomas Rothvoß, Rico Zenklusen. Matroids and integrality gaps for hypergraphic steiner tree relaxations. In Howard J. Karloff, Toniann Pitassi, editors, Proceedings of the 44th Symposium on Theory of Computing Conference, STOC 2012, New York, NY, USA, May 19 - 22, 2012. pages 1161-1176, ACM, 2012. [doi]
Abstract is missing.