W. Khadijah, M. Rivaie, M. Mamat, N. Hajar, N. ‘Aini, and Z. Zainal Abidin, “An application of conjugate gradient method under strong Wolfe line search for solving unconstrained optimization”, IJET, vol. 7, no. 3.28, pp. 12–16, Aug. 2018, doi: 10.14419/ijet.v7i3.28.20956.