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@article{DA_1980_20_a0, author = {L. T. Ashchepkov}, title = {Singular extremals of discontinuous control {systems.~I}}, journal = {Diskretnyj analiz i issledovanie operacij}, pages = {3--13}, publisher = {mathdoc}, number = {20}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DA_1980_20_a0/} }
L. T. Ashchepkov. Singular extremals of discontinuous control systems.~I. Diskretnyj analiz i issledovanie operacij, no. 20 (1980), pp. 3-13. http://geodesic.mathdoc.fr/item/DA_1980_20_a0/