TY  - JOUR
AU  - N. V. Svanidze
TI  - The existence of~invariant tori for~the~three-dimensional motion of~a billiard ball that are concentrated in~a~neighbourhood of~a ``closed geodesic on the boundary of the domain''
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1978
SP  - 267
EP  - 268
VL  - 33
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1978_33_4_a17/
LA  - en
ID  - RM_1978_33_4_a17
ER  -