Y. AL-BAYATI, ABBAS, and ASEEL MOAYAD QASIM. “A New Self Scaling PCG Algorithm With Dynamical Retards”. Journal of Education and Science (JES) 21, no. 1 (March 1, 2008): 113–134. Accessed August 6, 2025. https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23273.