TY  - JOUR
AU  - O. A. Timoshin
TI  - A criterion for finiteness of best approximation of a differential polynomial
JO  - Matematičeskie zametki
PY  - 1989
SP  - 114
EP  - 116
VL  - 46
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1989_46_6_a17/
LA  - ru
ID  - MZM_1989_46_6_a17
ER  -