%0 Journal Article
%A Varadarajan, K.
%T Numerical Invariants in Homotopical Algebra, I
%J Canadian journal of mathematics
%D 1975
%P 901-934
%V 27
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-097-5/
%R 10.4153/CJM-1975-097-5
%F 10_4153_CJM_1975_097_5