TY  - JOUR
AU  - V. A. Kostin
TI  - On the solution of a problem associated with an abstract cosine
JO  - Doklady Akademii Nauk
PY  - 1994
SP  - 584
EP  - 586
VL  - 336
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1994_336_5_a1/
LA  - ru
ID  - DAN_1994_336_5_a1
ER  -