P. Read Montague Peter Dayan Steven J. Nowlan Terrence J. Sejnowski Using Aperiodic Reinforcement for Directed Self-Organization During Development. 969-976 http://nips.djvuzone.org/djvu/nips05/0969.djvu 1992 conf/nips/1992 NIPS db/conf/nips/nips1992.html#MontagueDNS92