K. Dev, 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”, Int J Reprod Contracept Obstet Gynecol, vol. 8, no. 11, pp. 4314–4319, Oct. 2019.