The first condition in L.\,S.~Pontryagin's article: ``On the theory of differential games'' [Uspekhi Mat. Nauk \textbf{21} (1966), no.~4(130), 219--274; MR0204187]
Differencialʹnye uravneniâ, Tome 19 (1983) no. 6, pp. 923-938.

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@article{DE_1983_19_6_a0,
     author = {A. V. Arutyunov},
     title = {The first condition in {L.\,S.~Pontryagin's} article: {``On} the theory of differential games'' {[Uspekhi} {Mat.} {Nauk} \textbf{21} (1966), no.~4(130), 219--274; {MR0204187]}},
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A. V. Arutyunov. The first condition in L.\,S.~Pontryagin's article: ``On the theory of differential games'' [Uspekhi Mat. Nauk \textbf{21} (1966), no.~4(130), 219--274; MR0204187]. Differencialʹnye uravneniâ, Tome 19 (1983) no. 6, pp. 923-938. http://geodesic.mathdoc.fr/item/DE_1983_19_6_a0/