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M. Berger. Geometry. Berlin etc.: SpringerVerlag, 1987.
L. Bianchi. Lezioni di geometria differenziale. 3rd edition. Pisa: Enrico Spoerri, 1923 (Italian). iv+806, xi+832 pp.
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Thomsen. Berlin: Springer, 1929 (German). x+474 pp.
A.I. Bobenko. Discrete conformal maps and surfaces.  In: SIDE III  Symmetries and integrability of difference equations (Sabaudia, 1998), CRM Proc. Lecture Notes, 225 (2000), pp.
A.I. Bobenko, U. HertrichJeromin. Orthogonal nets and Clifford algebras. Toˆhoku Math. Publ. 20 (2001), 722.
[BobHoSp] A.I. Bobenko, T. Hoffmann, B.A. Springborn. Discrete minimal surfaces: geometry from combinatorics. Annals of Math., 2005 (to appear).
[BobHoSu] A.I. Bobenko, T. Hoffmann, Yu.B. Suris. Hexagonal circle patterns and integrable systems: patterns with the multiratio property and Lax equations on the regular triangular lattice. Int. Math. Res. Not. 2002, no. 3, 111164.
[BobMaS1] A.I. Bobenko, D. Matthes, Yu.B. Suris. Nonlinear hyperbolic equations in surface theory: integrable discretizations and approximation results. Algebra Anal., 2005 (to appear).
[BobMaS2] A.I. Bobenko, D. Matthes, Yu.B. Suris. Discrete and smooth orthogonal systems: C∞approximation. Int. Math. Res. Not., 45 (2003), 24152459.