https://papers.nips.cc/paper/1559-computational-differences-between-asymmetrical-and-symmetrical-networks.pdf (Publisher version)
Li, Z., & Dayan, P. (1999). Computational Differences between Asymmetrical and Symmetrical Networks. In M. Kearns, S. Solla, & D. Cohn (Eds.), Advances in Neural Information Processing Systems 11 (pp. 274-280). Cambridge, MA, USA: MIT Press.