Kolhe, Vishnu, and K. Dwidvedi. 2012. “Stability Constants of Trivalent Lanthanide and Yttrium Complexes With Ethyleneglycol-bis(2-Aminoethyl Ether)- N,N,N’N’-Tetraacetic Acid (EGTA) and Phthalic Acid-A Potentiometric Study”. Asian Journal of Chemistry 7 (3):568-70. https://asianpubs.org/index.php/ajchem/article/view/24359.