%0 Journal Article %A Doron Zeilberger %T How Berger, Felzenbaum and Fraenkel revolutionized Covering Systems the same way that George Boole revolutionized Logic %J The electronic journal of combinatorics %D 2001 %V 8 %N 2 %U http://geodesic.mathdoc.fr/articles/10.37236/1617/ %R 10.37236/1617 %F 10_37236_1617