ALDHLKI , T. Jassim. 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://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/2221.. Acesso em: 7 dec. 2025.