1. Caesarean section rates continue to rise, amid growing inequalities in access. (2021). https.//www.who.int/news/item/16-06-2021-caesarean-section-rates-continue-to-rise-amid-growing-inequalities-in-access.
2. Cesarean Section Anaesthesia. (2010). Accessed. April 3, 2024: https://www.news-medical.net/health/Cesarean-Section-Anaesthesia.aspx#:~:text=Here%2C%20a%20combination%20of%20spinal....
3. 100 years ago: Oskar Kreis, a pioneer in spinal obstetric analgesia at the University Women's Clinic of Basel (Article in German);Schneider MC;Anaesthesist,2001
4. Case of cesarean section under spinal anesthesia;Hopkins SR;JAMA,1902
5. Controllable spinal anesthesia;Pitkin GF;Am J Surg,1928