TY  - JOUR
AU  - R. S. Levitin
TI  - A metric problem for Frommer's first discrimination problem
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 2187
EP  - 2196
VL  - 8
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_12_a9/
LA  - ru
ID  - DE_1972_8_12_a9
ER  -