1. G. L. Alexanderson and J. E. Wetsel, 1970. Dissection of a tetrahedron, [p. 1171]
2. The Gauss-Bonnet theorem for Riemannian polyhedra;Allendoerfer, Carl B.;Trans. Amer. Math. Soc.,1943
3. A. Altshuler, 1969. Polyhedral realizations in R 2-manifolds in convex 4-polytopes, Ph.D. Thesis, Hebrew University, Jerusalem, 1969. (Hebrew) [p. 1138]
4. Lattice characterization of convex 3-polytopes and of polygonizations of 2-manifolds;Altshuler, Amos;Israel J. Math.,1970
5. On Schoenberg’s rational polygon problem;Ang, D. D.;J. Austral. Math. Soc.,1969