S. Tyagi, R. K. Agarwal, M. Agrawal, M. Kapoor, and S. Tiwari, “Study of vertical transmission of COVID-19 infection in COVID-19 positive obstetrical patients by comparing amniotic fluid and immediate neonatal COVID-19 RT-PCR”, Int J Reprod Contracept Obstet Gynecol, vol. 10, no. 9, pp. 3383–3388, Aug. 2021.