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@article{DAN_1983_268_4_a11, author = {N. A. Shirokov}, title = {Division by an inner function does not change the class of smoothness}, journal = {Doklady Akademii Nauk}, pages = {821--823}, publisher = {mathdoc}, volume = {268}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a11/} }
N. A. Shirokov. Division by an inner function does not change the class of smoothness. Doklady Akademii Nauk, Tome 268 (1983) no. 4, pp. 821-823. http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a11/