Citation: Kunz, M.; Armbruster, T.; Lager, G. A.; Schultz, A. J.; Goyette, R. J.; Lottermoser, W.; Amthauer, G. (1991). Fe, Ti ordering and octahedral distortions in acentric neptunite: temperature dependent X-ray and neutron structure refinements and Mossbauer Spectroscopy Sample: T = 493 K. Physics and Chemistry of Minerals, 18, pp. 199-213.