%0 Journal Article %A G. I. Furletov %T The equivalence of the $T_s(\alpha,\lambda_k)$ methods, $s>0$, the Ces\`aro and Riesz methods of arbitrary positive order, and Abel's method, for Fourier series in fundamental function systems of Laplace's operator %J Differencialʹnye uravneniâ %D 1970 %P 1086-1098 %V 6 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1970_6_6_a13/ %G ru %F DE_1970_6_6_a13