Sufficient conditions for the existence of discontinuous solutions for the simplest integral in the calculus of variations.~I
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1967), pp. 21-30.

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     author = {V. N. Koshelev and S. F. Morozov},
     title = {Sufficient conditions for the existence of discontinuous solutions for the simplest integral in the calculus of {variations.~I}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {21--30},
     publisher = {mathdoc},
     number = {11},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_11_a4/}
}
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V. N. Koshelev; S. F. Morozov. Sufficient conditions for the existence of discontinuous solutions for the simplest integral in the calculus of variations.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1967), pp. 21-30. http://geodesic.mathdoc.fr/item/IVM_1967_11_a4/