Yogi, J., B. Fiza, S. Godara, and M. Sinha. “SERUM 25 (OH) VITAMIN D AND ITS ROLE IN SECONDARY HYPERPARATHYROIDISM IN PATIENTS WITH CHRONIC KIDNEY DISEASE”. International Journal of Clinical and Biomedical Research, vol. 3, no. 2, Apr. 2017, pp. 5-9, https://www.ijcbr.com/index.php/ijcbr/article/view/138.