%0 Journal Article
%A Roitberg, Joseph
%T The product formula for Lusternik–Schnirelmann category
%J Algebraic and Geometric Topology
%D 2001
%P 491-502
%V 1
%N 1
%U http://geodesic.mathdoc.fr/articles/10.2140/agt.2001.1.491/
%R 10.2140/agt.2001.1.491
%F 10_2140_agt_2001_1_491