Citation: Haines, J.; Chateau, C.; L\'eger, J. M.; Le Sauze, A.; Diot, N.; Marchand, R.; Hull, S. (1999). Crystal structure of moganite-type phosphorus oxynitride: relationship to other twinned-quartz-based structures. Acta Crystallographica Section B, 55, pp. 677-682.