A case of impulsive singularity. Journal of Mathematics Mechanics and Computer Science, [S. l.], v. 117, n. 1, 2023. DOI: 10.26577/JMMCS.2023.v117.i1.01. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/1246. Acesso em: 5 jul. 2026.