A Synthesis of Thiopyran Pyridinium Perchlorate Compounds. Al-Nahrain Journal of Science, [S. l.], v. 16, n. 3, p. 7–18, 2013. Disponível em: https://mail.anjs.edu.iq/index.php/anjs/article/view/570. Acesso em: 4 apr. 2025.