KOKAN DPI DEPARTMENT OF MATHEMATICS. ON THE CANONICAL FORMATION OF CERTAIN SECOND-ORDER PARTIAL DIFFERENTIAL DIFFERENTIAL EQUATIONS IN A TYPE PRESERVING FIELD. International Journal on Integrated Education, [S. l.], v. 6, n. 12, p. 122–124, 2023. DOI: 10.31149/ijie.v6i12.5070. Disponível em: https://journals.researchparks.org/index.php/IJIE/article/view/5070. Acesso em: 20 sep. 2026.