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@article{DAN_1971_199_3_a10, author = {Yu. G. Ol'khovskii}, title = {On smooth relaxation operators}, journal = {Doklady Akademii Nauk}, pages = {548--550}, publisher = {mathdoc}, volume = {199}, number = {3}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_199_3_a10/} }
Yu. G. Ol'khovskii. On smooth relaxation operators. Doklady Akademii Nauk, Tome 199 (1971) no. 3, pp. 548-550. http://geodesic.mathdoc.fr/item/DAN_1971_199_3_a10/