Harsh, A., P. Harsh, D. K. Jain, R. Kumawat, S. Purohit, and M. Saify. “Correlation Between Pulp Stones and Serum Calcium Levels: A Preliminary Study”. International Journal of Health and Clinical Research, vol. 4, no. 6, Apr. 2021, pp. 145-7, https://ijhcr.com/index.php/ijhcr/article/view/1229.