Persson, L.-E., Tephnadze, G., Tutberidze, G. and Wall , P. 2021. Some new resuts concering strong convergence of Fejér means with respect to Vilenkin systems. Ukrains’kyi Matematychnyi Zhurnal. 73, 4 (Apr. 2021), 544 - 555. DOI:https://doi.org/10.37863/umzh.v73i4.226.