TY  - JOUR
AU  - A. F. Andreev
AU  - T. V. Stepanova
TI  - The number of Frommer substitutions sufficient to reveal all ${\rm TO}$-curves of the equation $X(x,\,y)\,dy=Y(x,\,y)\,dx$
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 1560
EP  - 1573
VL  - 4
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_9_a1/
LA  - ru
ID  - DE_1968_4_9_a1
ER  -