LasuriyaR. A. and StepanetsO. I. (1996) “Strong summability of orthogonal expansions of summable functions. II”, Ukrains’kyi Matematychnyi Zhurnal, 48(3), pp. 393-405. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5336 (Accessed: 24November2024).