Brovenko, A. V., Melezhik, P. N., & Poedinchuk A. К. (2001). A Method for the Regularization of One Class of Dual Series Equations. Ukrains’kyi Matematychnyi Zhurnal, 53(10), 1320-1327. https://umj.imath.kiev.ua/index.php/umj/article/view/4351