%0 Journal Article %A Geoffrey Exoo %A Milos Tatarevic %T New lower bounds for 28 classical Ramsey numbers %J The electronic journal of combinatorics %D 2015 %V 22 %N 3 %U http://geodesic.mathdoc.fr/articles/10.37236/5254/ %R 10.37236/5254 %F 10_37236_5254