Suntharasaj, Thitima, and Piyarat Sinpisut. “Are there any changes in twin deliveries at Songklanagarind Hospital during different periods of time?”. Thai Journal of Obstetrics and Gynaecology 11, no. 3 (July 1, 1999): 149–153. accessed September 28, 2026. https://he02.tci-thaijo.org/index.php/tjog/article/view/257132.