Nonclassical Symmetry of Differential Equations. Iraqi Journal of Science, [S. l.], p. 183–189, 2020. DOI: 10.24996/ijs.2020.SI.1.24. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/2221.. Acesso em: 6 may. 2024.