%0 Journal Article
%A Luis Montejano
%T A Quick proof of Singhof's cat (M x S1) = cat (M) + 1 theorem.
%J Manuscripta mathematica
%D 1983
%P 49-52
%V 42
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1983__42_154921/
%F MM2_1983__42_154921