Kaurav, M.S., Gajendra Gaur, and B.P. Singh. 2010. “Potentiometric Study of the Biligand 1 : 1 : 1 Ln(III)-CDTA-Valine Leucine Serine Complexes and Evaluation of Thermodynamic Parameters”. Asian Journal of Chemistry 18 (4):3027-32. https://asianpubs.org/index.php/ajchem/article/view/20726.