Siegler, M. A., Prewitt, J. H., Kelley, S. P., Parkin, S., Selegue, J. P., & Brock, C. P. (2010). More examples of the 15-crown-5..H2O-M-OH2..15-crown-5 motif, M = Al3+, Cr3+ and Pd2+. Acta Crystallographica. Section B, Structural Science, 66(Pt 2), 213-21. https://doi.org/10.1107/S0108768110007202