Bryant, Pamela L., Harwell, Chris R., Wu, Katherine, Fronczek, Frank R., Hall, Randall W., Butler, Leslie G. (1999) Single-Crystal27Al NMR of Andalusite and Calculated Electric Field Gradients:  the First Complete NMR Assignment for a 5-Coordinate Aluminum Site. The Journal of Physical Chemistry A, 103 (27). 5246-5252 doi:10.1021/jp990374i

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