Kápolnai, Richárd, Gábor Domokos, and Tímea Szabó. 2012. “Generating Spherical Multiquadrangulations by Restricted Vertex Splittings and the Reducibility of Equilibrium Classes”. Periodica Polytechnica Electrical Engineering and Computer Science 56 (1):11-20. https://doi.org/10.3311/PPee.7074.