Neubüser, J., Wondratschek, H., Bülow, R. (1971). „On crystallography in higher dimensions. I. General definitions”. Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography27 (6), 517-520. o. DOI:https://doi.org/10.1107/S0567739471001165.
