Dev, K., A. Sharma, and R. Sood. “Assessment of Maternal Serum β HCG Level in Pregnancy Induced Hypertension and Normotensive Patients and to Correlate Between the Level of β HCG With the Severity of Pre-Eclampsia and Eclampsia”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 8, no. 11, Oct. 2019, pp. 4314-9, doi:10.18203/2320-1770.ijrcog20194849.