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@article{MZM_1984_36_4_a6, author = {V. G. Kurbatov and I. S. Frolov}, title = {An operator variant of the maximum principle}, journal = {Matemati\v{c}eskie zametki}, pages = {531--535}, publisher = {mathdoc}, volume = {36}, number = {4}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1984_36_4_a6/} }
V. G. Kurbatov; I. S. Frolov. An operator variant of the maximum principle. Matematičeskie zametki, Tome 36 (1984) no. 4, pp. 531-535. http://geodesic.mathdoc.fr/item/MZM_1984_36_4_a6/