1. D. Aharonov, The hexagonal packing lemma and discrete potential theory, Can. Math. Bull. 33 (1990), 247–252.
2. L. Ahlfors and L. Bers, Riemann’s mapping theorem for variable metrics, Ann. of Math. 72 (1960), 385–404.
3. E.M. Andreev, On convex polyhedra in Lobačevskiĭ spaces, Mat. Sb. (N.S.) 81 (1970), 445–478; English transl. in Math. USSR Sb. 10 (1970), 413–440.
4. —, On convex polyhedra of finite volume in Lobačevskiĭ space, Mat. Sb. (N.S.) 83 (1970), 256–260; English transl. in Math. USSR Sb. 12 (1970), 255–259.
5. I. Bárány, Z. Füredi and J. Pach, Discrete convex functions and proof of the six circle conjecture of Fejes Tóth, Can. J. Math. 36 (1984), 569–576.