Patnaik, S., and C. Pandey. 2010. “PH-Metric Study on Tervalent Yttrium and Lanthanide Chelates Involving 2-Hydroxy-2-Methyl Propanoic Acid As Secondary Liagand”. Asian Journal of Chemistry 8 (3):425-30. https://asianpubs.org/index.php/ajchem/article/view/24084.