Brovenko, A. V., P. N. Melezhik, and PoedinchukA. К. 2001. “A Method for the Regularization of One Class of Dual Series Equations”. Ukrains’kyi Matematychnyi Zhurnal 53 (10), 1320-27. https://umj.imath.kiev.ua/index.php/umj/article/view/4351.