TY - JOUR AU - G. G. Kasparov TI - The $K$-functor in the theory of extensions of $C^*$-algebras JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1979 SP - 73 EP - 74 VL - 13 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1979_13_4_a14/ LA - ru ID - FAA_1979_13_4_a14 ER -