Kotei, Richard, et al. “Estimation of Flow-Duration and Low-Flow Frequency Parameters for the Sumanpa Stream at Mampong-Ashanti in Ghana for the 1985-2009 Period”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 15, no. 1, Jan. 2016, pp. 62-75, https://asrjetsjournal.org/American_Scientific_Journal/article/view/1199.