Kamfa, K., R. B. Yunus, and M. A. Lawan. “AN IMPROVED HYBRID CONJUGATE GRADIENT METHOD WITH SPECTRAL STRATEGY AND ITS APPLICATIONS IN COVID-19 PREDICTION”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, Vol. 19, no. 4, Sept. 2025, pp. 2803-14, doi:10.30598/barekengvol19iss4pp2803-2814.