SHIHAB, S.; RASHEED, M.; Rashid, A.; Rashid, T.; Abed Hamed, S. H.; Ridha AL-Sabbag, Y. A. M. Direct Restarted Pell Algorithm for Solving Calculus of Variation Problems. J. Al-Qadisiyah Comp. Sci. Math. 2021, 13, Math Page 169– 180.