Batalla, Jordi Mongay, Jarosław Śliwiński, Halina Tarasiuk, and Wojciech Burakowski. 2010. “Impact of Signaling System Performance on QoE in Next Generation Networks”. Journal of Telecommunications and Information Technology 42 (4): 117-30. https://doi.org/10.26636/jtit.2010.4.1121.