1. The full structures of each of the compounds are available free of charge from the Cambridge Crystallographic Data Centre , 12 Union Road, Cambridge CB2 1EZ, UK; fax: (44) 01223-336033; e-mail: deposit@ccdc.cam.ac.uk or via http://www.ccdc.cam.ac.uk/conts/retrieving.html. The reference codes for the supporting crystallographic data for La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and U, respectively, are CCDC 2017493-2017507.
2. Phosphorus and Water, USGS, 2020, https://www.usgs.gov/special-topic/water-science-school/science/phosphorus-and-water?qt-science_center_objects=0#qt-science_center_objects.
3. B. Oram, Phosphate in Surface Water Streams Lakes BF Environmental Consultants, Inc., 2020, https://water-research.net/index.php/phosphate-in-water.