Sheiso DS. A NOVEL RICHARDSON EXTRAPOLATION TECHNIQUE FOR NUMERICAL APPROXIMATION OF SINGULARLY PERTURBED CONVECTION-DIFFUSION PROBLEMS WITH INTEGRAL BOUNDARY CONDITIONS. JARMS [Internet]. 2024 Aug. 2 [cited 2025 Jun. 27];11(1):25-47. Available from: http://www.jarm-s.com/index.php/MS/article/view/50