Jirí Fiala, Daniël Paulusma. Comparing Universal Covers in Polynomial Time. In Edward A. Hirsch, Alexander A. Razborov, Alexei L. Semenov, Anatol Slissenko, editors, Computer Science - Theory and Applications, Third International Computer Science Symposium in Russia, CSR 2008, Moscow, Russia, June 7-12, 2008, Proceedings. Volume 5010 of Lecture Notes in Computer Science, pages 158-167, Springer, 2008. [doi]