Babaie-Kafaki, Saman, and Nezam Mahdavi-Amiri. “Two Modified Hybrid Conjugate Gradient Methods Based on a Hybrid Secant Equation”. Mathematical Modelling and Analysis, vol. 18, no. 1, Feb. 2013, pp. 32-52, https://doi.org/10.3846/13926292.2013.756832.