KHAMSALEE, P. .; JANTAUPALEE , A. .; WONGSAN, R. . The Design of an Analog Communication System for Cave Communication. Thailand Electrical Engineering Journal (TEEJ), [S. l.], v. 4, n. 2, p. 9–13, 2024. Disponível em: https://ph04.tci-thaijo.org/index.php/TEE_J/article/view/5970. Acesso em: 19 apr. 2025.