A. Kushpel, “Sharp Estimates of the Widths of Convolution Classes”, Izvestiya Acad. Nauk USSR, Seria Mat., 52:6 (1988), 1305-1323
S.M. Gomes, A.K. Kushplel,J. Levesley,D.L. Ragozin, “Interpolation on the Torus using sk-Splines with Number Theoretic Knots”, Journ. Approx. Theory, 98 (1999), 56-71
A. Kushpel, “Optimal cubature formulas on compact homogeneous manifolds”, Journ. of Func. Anal., 257 (2009), 1621-1629
A. Kushpel, S.A. Tozoni, “Entropy and Widths of Moltiplier Operators on Two-Point Homogeneous Spaces”, Constr. Approx., 35 (2012), 137-180
A. Kushpel, K. Tas, “The radii of sections of origin-symmetric convex bodies and their applications”, Journ. of Complexity, 62 (2021), 101504