Okuyade, W. I. A., I. U. Mbeledogu, and T. M. Abbey. “Heat Transfer Effects on Pulsaltile Flow in Tubes With Slowly Varying Cross-Sections”. Asian Journal of Applied Sciences, vol. 3, no. 6, Dec. 2015, https://www.ajouronline.com/index.php/AJAS/article/view/3354.