TY  - JOUR
AU  - G. A. Gal'perin
TI  - On systems of perfectly elastic balls moving in space or in a box
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 285
EP  - 288
VL  - 245
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_245_2_a1/
LA  - ru
ID  - DAN_1979_245_2_a1
ER  -