@article{TM_2003_243_a17,
     author = {M. K. Potapov and B. V. Simonov and S. Yu. Tikhonov},
     title = {On the {Besov} and {Besov{\textendash}Nikol'skii} {Classes} and on {Estimates} for the {Mixed} {Moduli} of {Smoothness} of {Fractional} {Derivatives}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {244--256},
     year = {2003},
     volume = {243},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2003_243_a17/}
}