On the notion of derivative system according to M.\,A.~Lavrentʹev
Doklady Akademii Nauk, Tome 136 (1961) no. 6, pp. 1298-1301.

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     author = {B. V. Shabat},
     title = {On the notion of derivative system according to {M.\,A.~Lavrentʹev}},
     journal = {Doklady Akademii Nauk},
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     year = {1961},
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B. V. Shabat. On the notion of derivative system according to M.\,A.~Lavrentʹev. Doklady Akademii Nauk, Tome 136 (1961) no. 6, pp. 1298-1301. http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a9/