Pattamadilok, Sirima, Kanaungkid Prasittikhet, Paiboon Maneewong, and Suranga Saguanwongse. 1994. “Influenza Surveillance in Bangkok, 1983-1993”. Journal of Health Science of Thailand 3 (4):329-40. https://www.thaidj.org/index.php/JHS/article/view/6619.