TY  - JOUR
AU  - L. D. Pustyl'nikov
TI  - Existence of invariant curves for maps close to degenerate maps, and a~solution of the~Fermi--Ulam problem
JO  - Sbornik. Mathematics
PY  - 1995
SP  - 231
EP  - 241
VL  - 82
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1995_82_1_a11/
LA  - en
ID  - SM_1995_82_1_a11
ER  -