Noga Alon, Konstantin Makarychev, Yury Makarychev, Assaf Naor. Quadratic forms on graphs. In Harold N. Gabow, Ronald Fagin, editors, Proceedings of the 37th Annual ACM Symposium on Theory of Computing, Baltimore, MD, USA, May 22-24, 2005. pages 486-493, ACM, 2005. [doi]
Abstract is missing.