Volosivets С.С., and Golubov Б.И. 2018. “Hardy and Hardy-Littlewood Fractional Modified Operators in the Hertz and Morrey-Hertz Spaces”. Bulletin of L.N. Gumilyov Eurasian National University. Mathematics, Computer Science, Mechanics Series 123 (2):66-70. https://bulmathmc.enu.kz/index.php/main/article/view/23.