Nurul  Aini, Nurul  Hajar, Mustafa  Mamat, Norhaslinda  Zull, Mohd  Rivaie, 
    Hybrid Quasi-Newton and Conjugate Gradient Method for Solving Unconstrained Optimization Problems,
    Journal of Engineering and Applied Sciences,
    Volume 12,Issue 18,
    2017,
    Pages 4627-4631,
    ISSN 1816-949x,
    jeasci.2017.4627.4631,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2017.4627.4631)
    Abstract: A hybrid of quasi-Newton and conjugate gradient method combines the search direction of the two methods to produce a new algorithm for solving unconstrained optimization functions. In this study, a modified hybrid Quasi-Newton method is presented where a new conjugate gradient coefficient is employed in the search direction. Based on the numerical results, the proposed hybrid method proved to be robust in comparison to the original quasi-Newton method and other hybrid methods.
    Keywords: Hybrid quasi-Newton;conjugate gradient;Armijo line search;hybrid methods;optimization;modified