Geodesic
Some issues concerning approximations of functions by Fourier–Bessel sums
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 53 (2013) no. 7, pp. 1051-1057

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Some issues concerning the approximation of one-variable functions from the class $\mathbb{L}_2$ by $n$th-order partial sums of Fourier–Bessel series are studied. Several theorems are proved that estimate the best approximation of a function characterized by the generalized modulus of continuity. 
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     title = {Some issues concerning approximations of functions by {Fourier{\textendash}Bessel} sums},
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V. A. Abilov; F. V. Abilova; M. K. Kerimov. Some issues concerning approximations of functions by Fourier–Bessel sums. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 53 (2013) no. 7, pp. 1051-1057. http://geodesic.mathdoc.fr/item/ZVMMF_2013_53_7_a0/