Mahmood, S. S. “Modified BFGS Update (H-Version) Based on the Determinant Property of Inverse of Hessian Matrix for Unconstrained Optimization”. Baghdad Science Journal, vol. 17, no. 3(Suppl.), Sept. 2020, p. 0994, doi:10.21123/bsj.2020.17.3(Suppl.).0994.