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@article{MZM_1982_32_1_a2, author = {L. V. Zhizhiashvili}, title = {Validity of {A.\,N.~Kolmogorov's} theorem for conjugate functions of several variables}, journal = {Matemati\v{c}eskie zametki}, pages = {13--21}, publisher = {mathdoc}, volume = {32}, number = {1}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1982_32_1_a2/} }
L. V. Zhizhiashvili. Validity of A.\,N.~Kolmogorov's theorem for conjugate functions of several variables. Matematičeskie zametki, Tome 32 (1982) no. 1, pp. 13-21. http://geodesic.mathdoc.fr/item/MZM_1982_32_1_a2/