Ogunleye, O., M. Waheed, and G. Odewole. “OPTIMAL ALLOCATION OF PIPE DIAMETERS IN PIPE NETWORKS USING MODIFIED ASSIGNMENT PROBLEM APPROACH”. LAUTECH Journal of Engineering and Technology, Vol. 3, no. 1, Apr. 2005, pp. 76-81, https://laujet.com/index.php/laujet/article/view/256.