“FOUR-BAR VARIATIONS.” How Round Is Your Circle?: Where Engineering and Mathematics Meet, by John Bryant and Chris Sangwin, Princeton University Press, PRINCETON; OXFORD, 2008, pp. 46–64, www.jstor.org/stable/j.ctt7rq7h.7. Accessed 27 July 2021.
Bryant, J., & Sangwin, C. (2008). FOUR-BAR VARIATIONS. In How Round Is Your Circle?: Where Engineering and Mathematics Meet (pp. 46-64). PRINCETON; OXFORD: Princeton University Press. Retrieved July 27, 2021, from http://www.jstor.org/stable/j.ctt7rq7h.7
Bryant, John, and Chris Sangwin. "FOUR-BAR VARIATIONS." In How Round Is Your Circle?: Where Engineering and Mathematics Meet, 46-64. PRINCETON; OXFORD: Princeton University Press, 2008. Accessed July 27, 2021. http://www.jstor.org/stable/j.ctt7rq7h.7.
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