Shishkina, Lidia P., and Grigory I. Shishkin. “Robust Difference Scheme for the Cauchy Problem for a Singularly Perturbed Ordinary Differential Equation”. Mathematical Modelling and Analysis 23, no. 4 (October 9, 2018): 527-537. Accessed December 22, 2024. https://jeelm.vgtu.lt/index.php/MMA/article/view/2432.