“A FOUR-STEP BLOCK HYBRID BACKWARD DIFFERENTIATION FORMULAE FOR THE SOLUTION OF GENERAL SECOND ORDER ORDINARY DIFFERENTIAL EQUATION”. FUDMA JOURNAL OF SCIENCES 9, no. 4 (April 30, 2025): 239–244. Accessed September 17, 2025. http://162.254.38.185/index.php/fjs/article/view/3338.