Harmonic parametrization of geodesic quadrangles on surfaces of constant curvature and 2-D quasi-isometric grids. Chumakov, Gennadij, Chumakov, Sergei G. (1997) Electronic Journal of Differential Equations (EJDE) [electronic only]
Higher-dimensional central projection into 2-plane with visibility and applications J. Katona, E. Molnár, I. Prok, J. Szirmai (2011) Kragujevac Journal of Mathematics