Usage of Partial Differential Equations in Langrange Theorem: Applications of Partial Differential Equations in Optical Devices. Journal of Advances and Scholarly Researches in Allied Education, [S. l.], v. 15, n. 9, p. 190–193, 2018. Disponível em: https://ignited.in/index.php/jasrae/article/view/8828.. Acesso em: 8 jun. 2025.