TY  - JOUR
AU  - V. V. Vedyushkina
TI  - Topological type of isoenergy surfaces of billiard books
JO  - Sbornik. Mathematics
PY  - 2021
SP  - 1660
EP  - 1674
VL  - 212
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_2021_212_12_a0/
LA  - en
ID  - SM_2021_212_12_a0
ER  -