AI-Janobi, A.A., M.F. Wahby, A.M. Aboukarima, and S.A. Al-Hamed. 2002. “Influence of Chisel Plow Shank Shape on Horizontal and Vertical Force Requirements”. Journal of Agricultural and Marine Sciences [JAMS] 7 (1):13-19. https://journals.squ.edu.om/index.php/jams/article/view/589.