KALIMBETOV, B.T.; TEMIRBEKOV, A.N.; YESKARAYEVA, B.I. Internal boundary layer in a singularly perturbed problem of fractional derivative. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 100, n. 4, p. 92–100, 2020. DOI: 10.31489/2020m4/92-100. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/387. Acesso em: 4 sep. 2025.