Blatov IA, Pokornaya IY, Strygin VV. Collocation method for solving singularly perturbed boundary-value problems by using cubic splines. Ukr. Mat. Zhurn. [Internet]. 1994Apr.25 [cited 2024Jul.27];46(4):411–417. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5738