%0 Journal Article %A Stanley, Donald %T On the Lusternik-Schnirelmann Category of Maps %J Canadian journal of mathematics %D 2002 %P 608-633 %V 54 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2002-022-6/ %R 10.4153/CJM-2002-022-6 %F 10_4153_CJM_2002_022_6