Walker, Ellen Lowenfeld, Takeo Kanade, and Martin Herman. “A Framework for Representing and Reasoning about Three-Dimensional Objects for Visione”. AI Magazine 9, no. 2 (June 15, 1988): 47. Accessed April 20, 2024. https://ojs.aaai.org/aimagazine/index.php/aimagazine/article/view/675.