Daud, K. , Abidin, A. , Hamzah, N. , Singh, H.. "Detection of Sags, Swells, and Transients Using Windowing Technique Based On Continuous S-Transform (CST)". World Academy of Science, Engineering and Technology, Open Science Index 77, International Journal of Electrical and Computer Engineering (2013), 7(5), 568 - 575.