Potapov, M. K., Berisha, F. M., “Approximation of classes of functions defined by a generalized $k$th modulus of smoothness”, East J. Approx., 4:2 (1998), 217–241
Potapov, M. K., Berisha, F. M., “Direct and inverse theorems of approximation theory for a generalized modulus of smoothness”, Anal. Math., 25:3 (1999), 187–203
Potapov M. K., Berisha F. M., “On Jackson's theorem for the modulus of smoothness determined by a nonsymmetric generalized shift operator”, Vestnik Moskov. Univ. Ser. I Mat. Mekh., 3 (2000), 7–15, 77; Engl. transl., Moscow Univ. Math. Bull., 55 (2000)
M. K. Potapov, F. M. Berisha, “On the Connection Between the Best Approximation by Algebraic Polynomials and the Modulus of Smoothness of Order $r$”, CMFD, 25 (2007), 149–164; Journal of Mathematical Sciences, 155:1 (2008), 153–169
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M. K. Potapov, F. M. Berisha, “On Jackson's theorem for the modulus of smoothness determined by a nonsymmetric generalized shift operator”, Vestnik Moskov. Univ. Ser. 1. Mat. Mekh., 2000, no. 3, 7–15
M. K. Potapov, F. M. Berisha, “On the connection between a $r$-order modulus of smoothness and the best approximation by algebraic polynomials”, Fundam. Prikl. Mat., 5:2 (1999), 563–587
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M. Beriša, F. Berisha, M. K. Potapov, “Polynomial approximation in an integral metric with Jacobi weight”, Vestnik Moskov. Univ. Ser. 1. Mat. Mekh., 1990, no. 5, 33–38
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