Vikraman Arvind Partha Mukhopadhyay Prajakta Nimbhorkar Erdos-Renyi Sequences and Deterministic construction of Expanding Cayley Graphs. 81 2011 18 Electronic Colloquium on Computational Complexity (ECCC) http://eccc.hpi-web.de/report/2011/081 db/journals/eccc/eccc18.html#ArvindMN11