A. Markovic, Z. Peric, S. Panic, P. Spalevic, and Z. Todorovic, “Improved Composite Q-Function Approximation and its Application in ASEP of Digital Modulations over Fading Channels”, ELEKTRON ELEKTROTECH, vol. 23, no. 3, pp. 83–88, Jun. 2017, doi: 10.5755/j01.eie.23.3.18338.