Some problems in the theory of differential equations with a~small parameter
Informatics and Automation, Topology, ordinary differential equations, dynamical systems, Tome 169 (1985), pp. 99-118.

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     author = {L. S. Pontryagin and E. F. Mishchenko},
     title = {Some problems in the theory of differential equations with a~small parameter},
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     year = {1985},
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     url = {http://geodesic.mathdoc.fr/item/TRSPY_1985_169_a6/}
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L. S. Pontryagin; E. F. Mishchenko. Some problems in the theory of differential equations with a~small parameter. Informatics and Automation, Topology, ordinary differential equations, dynamical systems, Tome 169 (1985), pp. 99-118. http://geodesic.mathdoc.fr/item/TRSPY_1985_169_a6/