Reciprocal transformations and their invariants
Differencialʹnye uravneniâ, Tome 25 (1989) no. 7, pp. 1256-1265.

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@article{DE_1989_25_7_a21,
     author = {E. V. Ferapontov},
     title = {Reciprocal transformations and their invariants},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1256--1265},
     publisher = {mathdoc},
     volume = {25},
     number = {7},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_7_a21/}
}
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E. V. Ferapontov. Reciprocal transformations and their invariants. Differencialʹnye uravneniâ, Tome 25 (1989) no. 7, pp. 1256-1265. http://geodesic.mathdoc.fr/item/DE_1989_25_7_a21/