@article{VMUMM_2012_1_a2,
     author = {M. K. Potapov and B. V. Simonov},
     title = {Improvement of the {Ul'yanov} inequality for mixed moduli of smoothness for functions with lacunary {Fourier} coefficients},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {18--24},
     year = {2012},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2012_1_a2/}
}