穿孔多面体
I.; Schröder, P.; Sullivan, J. M. et al., Discrete Differential Geometry, Oberwolfach Seminars, 38, Springer-Verlag, pp. 191–213, arXiv:math.MG/0412093, doi:10.1007/978-3-7643-8621-4_10, ISBN 978-3-7643-8620-7 .
↑ Szilassi, Lajos (1986), “Regular toroids”, Structural Topology 13: 69–80, http://haydn.upc.es/people/ros/StructuralTopology/ST13/st13-06-a3-ocr.pdf .
↑ Heawood, P. J. (1890), “Map colouring theorems”, Quarterly J. Math. Oxford Ser. 24: 322–339
↑ Stewart 1980.