Trigonometric series with ( k → , s → ) -monotone coefficients in spaces with mixed quasinorm. Simonov, B.V. — 2004 Sibirskij Matematicheskij Zhurnal
Ob ocenkah smeshannogo modulya gladkosti funkcii s preobrazovannym ryadom Fur'e M.K. Potapov; B.V. Simonov; B. Lakovich — 1995 Publications de l'Institut Mathématique
On estimates for the mixed modulus of continuity of a function with a transformed Fourier series. Potapov, M.K.; Simonov, B.V.; Lakovich, B. — 1995 Publications de l'Institut Mathématique. Nouvelle Série