Ndemo, Zakaria, and David Mtetwa. “Mathematics Education undergraduates’ Personal Definitions of the Notion of Angle of Contiguity in Kinematics”. JRAMathEdu (Journal of Research and Advances in Mathematics Education) 6, no. 2 (March 24, 2021): 111–127. Accessed November 17, 2025. https://journals2.ums.ac.id/jramathedu/article/view/9358.