ผิวอ่อน ป. Legendre’s Function and Additional Solution of a Weighted Heat Equation. KKU Science Journal, [S. l.], v. 41, n. 4, p. 899–907, 2013. Disponível em: https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/249190. Acesso em: 26 aug. 2026.