Perline, Ron, and Sergei Tabachnikov. “Geometry of Integrable Linkages”. Journal of Experimental Mathematics 1, no. 1 (February 28, 2025): 94–123. Accessed August 25, 2026. https://ticket17180.pkpmisc01.publicknowledgeproject.org/index.php/jem/article/view/Vol-1Issue-1Paper-5.