Olisakwe, Sunday Isaac, Azubike J. Ekpunobi, and Peter I. Ekwo. 2014. “Effect of Velocity on Nanotribiology of Silicon (Si), Germanium (Ge) and Tin (Sn)”. Asian Journal of Applied Sciences 2 (5). https://ajouronline.com/index.php/AJAS/article/view/1143.