Geodesic
The number of Frommer substitutions sufficient to reveal all ${\rm TO}$-curves of the equation $X(x,\,y)\,dy=Y(x,\,y)\,dx$
Differencialʹnye uravneniâ, Tome 4 (1968) no. 9, pp. 1560-1573.

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     author = {A. F. Andreev and T. V. Stepanova},
     title = {The number of {Frommer} substitutions sufficient to reveal all ${\rm TO}$-curves of the equation $X(x,\,y)\,dy=Y(x,\,y)\,dx$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1560--1573},
     publisher = {mathdoc},
     volume = {4},
     number = {9},
     year = {1968},
     language = {ru},
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A. F. Andreev; T. V. Stepanova. The number of Frommer substitutions sufficient to reveal all ${\rm TO}$-curves of the equation $X(x,\,y)\,dy=Y(x,\,y)\,dx$. Differencialʹnye uravneniâ, Tome 4 (1968) no. 9, pp. 1560-1573. http://geodesic.mathdoc.fr/item/DE_1968_4_9_a1/