MICHALSKI, Wojciech. Technical and Regulatory Issues of Emergency Call Handling. Journal of Telecommunications and Information Technology, Warsaw, Poland, v. 37, n. 3, p. 123–129, 2009. DOI: 10.26636/jtit.2009.3.950. Disponível em: https://jtit.pl/jtit/article/view/950. Acesso em: 20 aug. 2026.