M. S. Syavavko, “$J$-fractional regularization of linear ill-posed equations”, Ukr. Mat. Zhurn., vol. 48, no. 8, pp. 1130–1143, Aug. 1996, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5257