Dizon, Paul Justin, et al. “The Efficacy and Safety of Butamirate Citrate As Pre-Medication to Alleviate Post-Bronchoscopy Cough: A Double-Blind Randomized Placebo-Controlled Trial”. Lung Center of the Philippines Scientific Proceedings, vol. 13, no. 1, Nov. 2025, https://ticket17180.pkpmisc01.publicknowledgeproject.org/index.php/splcp/article/view/14721.