en Schattschneider, Doris; Senechal, Marjorie (), „Tilings”, În Goodman, Jacob E.; O'Rourke, Joseph, Handbook of Discrete and Computational Geometry, Discrete Mathematics and Its Applications (ed. 2nd), CRC Press, pp. 53–72, ISBN9781420035315. See in particular the table on p. 62 relating IUC notation to orbifold notation.
enJohnson, Norman W.; Weiss, Asia Ivić (), „Quadratic integers and Coxeter groups”, Canadian Journal of Mathematics, 51 (6): 1307–1336, doi:10.4153/CJM-1999-060-6. See in particular the top of p. 1320.