1. Bianchi, L. (1902). Lezioni di Geometria Differenziale, Ecole Bibliotheque.
2. Darboux, G. (1887–1896). Lecons sur la Theorie Generate des Surfaces et les Applications Geometriques du Calcul Infinitesimal, Gauthier-Villars.
3. Pinkall, U. (2008). Discrete Differential Geometry. Oberwolfach Seminars, Birkhäuser.
4. Discrete surfaces with constant negative Gaussian curvature and the Hirota equation;Bobenko;Differ. Geom.,1996
5. Application of soliton theory to the construction of pseudospherical surfaces in R3;Melko;Ann. Glob. Anal. Geom.,1993