References [12] and [14] are:
[12] Jean-Marie Delarue. Plis, Règles Géométriques et Principes Structurants. Ecole D’architecture Paris-Villemin, 1997
[14] Vincent Borrelli, Saïd Jabrane, Francis Lazarus, and Boris Thibert. Flat tori in three-dimensional space and convex integration. Proc. Natl. Acad. Sci. U. S. A., 109(19):7218–23, May 2012. ISSN 1091-6490.
From the same paper as the previous 2 images
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