K Sanjiv Raj, M Nirmaladevi, V K Subramanian. “Effect of Sr2+ Ions on Crystallization Process of CaCO3 in Presence of EDTA, NTA and Mixture of EDTA and NTA”. International Journal of Advanced Science and Technology, Vol. 29, no. 08, Dec. 2020, pp. 6139-4, https://sersc.org/journals/index.php/IJAST/article/view/34188.