Batkauskas, V., and A. Kajackas. “Quality of Heterogeneous Mobile Data Services: Capabilities and End-User Achievements”. Elektronika ir Elektrotechnika 101, no. 5 (April 27, 2010): 43-46. Accessed October 5, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/9423.