Ali Al-Juboury, Hussain. “Estimation of the Error of Runge-Kutta’s Method in Multivariate Case”. Ann. Sofia Univ. Fac. Math. and Inf. 83, no. 1 (December 12, 1992): 81–88. Accessed November 24, 2024. https://ftl5.uni-sofia.bg./index.php/fmi/article/view/488.