TY  - JOUR
AU  - D. Kan
TI  - A combinatorial definition of homotopy groups
JO  - Matematika
PY  - 1962
SP  - 3
EP  - 32
VL  - 6
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAT_1962_6_1_a0/
LA  - ru
ID  - MAT_1962_6_1_a0
ER  -