%0 Journal Article
%A Takens, Floris
%T The Lusternik-Schnirelman categories of a product space
%J Compositio Mathematica
%D 1970
%P 175-180
%V 22
%N 2
%I Wolters-Noordhoff Publishing
%U http://archive.numdam.org/item/CM_1970__22_2_175_0/
%G en
%F CM_1970__22_2_175_0