TY  - JOUR
AU  - Varadarajan, K.
TI  - Numerical Invariants in Homotopical Algebra, I
JO  - Canadian journal of mathematics
PY  - 1975
SP  - 901
EP  - 934
VL  - 27
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-097-5/
DO  - 10.4153/CJM-1975-097-5
ID  - 10_4153_CJM_1975_097_5
ER  -