Wu, Leijia, and Kumbesan Sandrasegaran. “A Study on RAT Selection Algorithms in Combined UMTS/GSM Networks”. ECTI Transactions on Electrical Engineering, Electronics, and Communications 6, no. 2 (December 31, 2007): 177–183. Accessed May 11, 2024. https://ph02.tci-thaijo.org/index.php/ECTI-EEC/article/view/171789.