Olusola, O. O., O. I. Patrick, and A. I. Folahan. “Intraoperative Retrobulbar Hemorrhage Following Subtenon Anaesthesia and Valsalva Manoeuver: A Case Report: General Ophthalmology”. Transactions of the Ophthalmological Society of Nigeria, vol. 2, no. 1, Apr. 2023, https://tosn.org.ng/index.php/home/article/view/215.