FOGEL, T. B.; LUCKY, S. S.; MANDY, J. A.; WELLBIRTH, B. B. Reducing the PDEs to ODEs through lie vectors using the integrated factors. International research journal of management, IT and social sciences, [S. l.], v. 6, n. 5, p. 193–203, 2019. DOI: 10.21744/irjmis.v6n5.732. Disponível em: https://sloap.org/journals/index.php/irjmis/article/view/732. Acesso em: 16 jul. 2024.