TY  - JOUR
AU  - É. F. Kaplenko
AU  - V. A. Ponomarev
TI  - Cross ratio of a nondegenerate quadruple of subspaces
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1981
SP  - 76
EP  - 77
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1981_15_1_a10/
LA  - ru
ID  - FAA_1981_15_1_a10
ER  -