Dimitris Achlioptas Ehud Friedgut A Sharp Threshold for k-Colorability. 63-70 1999 14 Random Struct. Algorithms 1 db/journals/rsa/rsa14.html#AchlioptasF99 https://doi.org/10.1002/(SICI)1098-2418(1999010)14:1<63::AID-RSA3>3.0.CO;2-7