Yoshiharu Kohayakawa Bernd Kreuter Angelika Steger An Extremal Problem For Random Graphs And The Number Of Graphs With Large Even-Girth. 101-120 1998 18 Combinatorica 1 http://link.springer.de/link/service/journals/00493/bibs/8018001/80180101.htm db/journals/combinatorica/combinatorica18.html#KohayakawaKS98