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2. Aeropic (2013). Sphericon 2 & 4. YouTube video. Retrieved from https://www.youtube.com/watch?v=8OgA3UW9Adc
3. Akgün T., Koman A. & Akleman E. (2006, August 4–8). Developable sculptural forms of Ilhan Koman. Bridges London: Mathematics, music, art, architecture, culture (pp. 343–350). London: The Bridges Organization. Retrieved from http://archive.bridgesmathart.org/2006/bridges2006-343.html
4. Unwrapping Curves from Cylinders and Cones