Nurhanani Abu Bakar. “Solving Large System of Linear Equation Using Successive Over‐ Relaxation, Conjugate Gradient and Preconditioned Conjugate Gradient”. Applied Mathematics and Computational Intelligence (AMCI), vol. 6, Dec. 2017, pp. 83-98, https://ejournal.unimap.edu.my/index.php/amci/article/view/189.