Otoo, D., S. K. Amponsah, and C. Sebil. “Capacitated Clustering and Collection of Solid Waste in Kwadaso Estate, Kumasi”. Journal of Asian Scientific Research, vol. 4, no. 8, Aug. 2014, pp. 460-72, https://archive.aessweb.com/index.php/5003/article/view/3662.