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@article{MZM_1990_47_5_a6, author = {V. L. Levin}, title = {A~problem of complex analysis arising in optimal control theory}, journal = {Matemati\v{c}eskie zametki}, pages = {45--51}, publisher = {mathdoc}, volume = {47}, number = {5}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a6/} }
V. L. Levin. A~problem of complex analysis arising in optimal control theory. Matematičeskie zametki, Tome 47 (1990) no. 5, pp. 45-51. http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a6/