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@article{DAN_1991_320_2_a7, author = {V. I. Sumin}, title = {Strong degeneration of singular controls in distributed problems}, journal = {Doklady Akademii Nauk}, pages = {295--299}, publisher = {mathdoc}, volume = {320}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a7/} }
V. I. Sumin. Strong degeneration of singular controls in distributed problems. Doklady Akademii Nauk, Tome 320 (1991) no. 2, pp. 295-299. http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a7/