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@article{DA_1985_26_a2, author = {A. N. Burdukovskii}, title = {Conditions for the optimality of singular controls in the {Goursat--Darboux} problem}, journal = {Diskretnyj analiz i issledovanie operacij}, pages = {31--39}, publisher = {mathdoc}, number = {26}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DA_1985_26_a2/} }
A. N. Burdukovskii. Conditions for the optimality of singular controls in the Goursat--Darboux problem. Diskretnyj analiz i issledovanie operacij, no. 26 (1985), pp. 31-39. http://geodesic.mathdoc.fr/item/DA_1985_26_a2/