TY  - JOUR
AU  - G. G. Kasparov
TI  - The operator $K$-functor and extensions of $C^*$-algebras
JO  - Izvestiya. Mathematics 
PY  - 1981
SP  - 513
EP  - 572
VL  - 16
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1981_16_3_a3/
LA  - en
ID  - IM2_1981_16_3_a3
ER  -