BakariI. A., BabubaS., TumbaP., and DanladiA. “TWO-STEP HYBRID BLOCK BACKWARD DIFFERENTIATION FORMULAE FOR THE SOLUTION OF STIFF ORDINARY DIFFERENTIAL EQUATIONS”. FUDMA JOURNAL OF SCIENCES, Vol. 4, no. 1, Apr. 2020, pp. 668 -76, https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/101.