Every Graph of Sufficiently Large Average Degree Contains a C<sub>4</sub>-Free Subgraph of Large Average Degree.

Daniela Kühn Deryk Osthus Every Graph of Sufficiently Large Average Degree Contains a C<sub>4</sub>-Free Subgraph of Large Average Degree. 155-162 2004 24 Combinatorica 1 http://www.springerlink.com/index/10.1007/s00493-004-0010-2 db/journals/combinatorica/combinatorica24.html#KuhnO04