Naddoni DB, Balakundi SK, Assainar KK. The effect of nitrous oxide (entonox) on labour. Int J Reprod Contracept Obstet Gynecol [Internet]. 2017 Feb. 23 [cited 2025 Oct. 13];5(3):835-9. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/778