Alexander Gamburd Shlomo Hoory Mehrdad Shahshahani Aner Shalev B. Virág On the girth of random Cayley graphs. 100-117 2009 35 Random Struct. Algorithms 1 http://dx.doi.org/10.1002/rsa.20266 db/journals/rsa/rsa35.html#GamburdHSSV09