On linguistic dynamical systems, families of graphs of large girth, and cryptography. Ustimenko, V.A. — 2005 Zapiski Nauchnykh Seminarov POMI
New upper bounds on the order of cages. Lazebnik, F.; Ustimenko, V.A.; Woldar, A.J. — 1997 The Electronic Journal of Combinatorics [electronic only]