WOLFRAM MATERIALS for the ARTICLE:
Zimmermann, L., Shea, K., and Stanković, T. (2019).
Conditions for Rigid and Flat Foldability of Degree-n Vertices in Origami.
ASME. J. Mechanisms Robotics. February 2020; 12(1): 011020.
https://doi.org/10.1115/1.4045249