Gimba , M. M, L. C. Edomwonyi-Otu, N. Yusuf, and A. Abubakar. 2019. “Drag Reduction With Polymer Mixtures in Pipes of Different Diameters”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT 15 (3), 792-801. http://www.azojete.com/index.php/azojete/article/view/61.