Lata Omprakash Mahato, Shrikant Verma and Awantika Thakur (2019) “A study to estimate the gestational age by measuring bi-parietal diameter of the foetuses in Gravid Females”, Asian Pacific Journal of Health Sciences, 6(4), pp. 23–27. doi: 10.21276/apjhs.2019.6.4.6.