QI, Feng. Simple forms for coefficients in two families of ordinary differential equations. Global Journal of Mathematical Analysis, [S. l.], v. 6, n. 1, p. 7–9, 2018. DOI: 10.14419/gjma.v6i1.9778. Disponível em: https://www.sciencepubco.com/index.php/GJMA/article/view/9778.. Acesso em: 7 may. 2024.