TY  - JOUR
AU  - R. S. Levitin
TI  - Frommer's first distinguishing problem for perturbations from Osgood and Tamarkin classes
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1236
EP  - 1246
VL  - 5
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_7_a8/
LA  - ru
ID  - DE_1969_5_7_a8
ER  -