International
Tables for Crystallography Volume A Spacegroup symmetry Edited by Th. Hahn © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. A, ch. 1.4, p. 10
Section 1.4.7. Symmetry axes inclined to the plane of projection (in cubic space groups only)^{a}Institut für Kristallographie, RheinischWestfälische Technische Hochschule, Aachen, Germany 
^{†}The dots mark the intersection points of axes with the plane at . In some cases, the intersection points are obscured by symbols of symmetry elements with height ; examples: (203), origin choice 2; (222), origin choice 2; (223); (229); (230).
