Siegler, M. ., Prewitt, J. ., Kelley, S. ., Parkin, S. ., Selegue, J. ., & Brock, C. . (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