Eckert, J., Gourdon, O., Jacob, D., Meral, C., Monteiro, P., Vogel, S., Wirth, R., Wenk, H.-R. (2015): Ordering of water in opals with different microstructures. - European Journal of Mineralogy, 27, 203-213.https://doi.org/10.1127/ejm/2015/0027-2428