Yoichi Maeda, Hiroshi Maehara. Observing an Angle from Various Viewpoints. In Jin Akiyama, Mikio Kano, editors, Discrete and Computational Geometry, Japanese Conference, JCDCG 2002, Tokyo, Japan, December 6-9, 2002, Revised Papers. Volume 2866 of Lecture Notes in Computer Science, pages 200-203, Springer, 2002. [doi]
Abstract is missing.