Bường, Nguyễn, and Đặng Thị Hải Hà. 2012. “About Convergence Rates in Regularization for Ill-Posed Operator Equations of Hammerstein Type”. Journal of Computer Science and Cybernetics 23 (1):50-58. https://doi.org/10.15625/1813-9663/23/1/1114.