Navin Goyal, Neil Olver, F. Bruce Shepherd. The vpn conjecture is true. In Richard E. Ladner, Cynthia Dwork, editors, Proceedings of the 40th Annual ACM Symposium on Theory of Computing, Victoria, British Columbia, Canada, May 17-20, 2008. pages 443-450, ACM, 2008. [doi]
Abstract is missing.