V. Appannagari, D. K., B. Kingsbury, S. Rathore, J. E. Mathews, and M. Gowri, “Maternal and neonatal outcome in pregnancy at 40 years and beyond in a tertiary care center: a retrospective case control study”, Int J Reprod Contracept Obstet Gynecol, vol. 8, no. 8, pp. 3129–3134, Jul. 2019.