BARAN, Kamil; CEGŁOWSKI, Paweł; KULA, Sławomir. Silent Calls – Causes and Measurements. Journal of Telecommunications and Information Technology, [S. l.], v. 59, n. 1, p. 20–22, 2015. DOI: 10.26636/jtit.2015.1.772. Disponível em: https://jtit.pl/jtit/article/view/772. Acesso em: 4 jun. 2026.