Singh, S., Mohan, U., Shukla, N., Pandey, S., Singh, S. S., Pandey, U. S. and Tiwari, S. (1995) “Case control study of Electrocardiographic changes in pregnant women”, Indian Journal of Community Health, 8(2,3), pp. 24 - 27. Available at: https://www.iapsmupuk.org/journal/index.php/IJCH/article/view/28 (Accessed: 29November2020).