ALAM, M. S.; KHAN, M. R. H. Message Based Analysis on Signaling System Number 7 and its Comparison with Multi-Frequency Coded Signaling. Daffodil International University Journal of Science and Technology, [S. l.], v. 7, n. 1, p. 15–19, 2012. DOI: 10.3329/diujst.v7i1.9582. Disponível em: https://www.banglajol.info/index.php/DIUJST/article/view/9582. Acesso em: 30 jul. 2021.