Balaišis, P., Eidukas, D. and Gočelkienė, L. (2009) “Electronic Payment Systems for Communications Services”, Elektronika ir Elektrotechnika, 91(3), pp. 3-8. Available at: https://eejournal.ktu.lt/index.php/elt/article/view/10269 (Accessed: 22December2024).