Suntharasaj, T. and Sinpisut , P. (1999) “Are there any changes in twin deliveries at Songklanagarind Hospital during different periods of time?”, Thai Journal of Obstetrics and Gynaecology. Bangkok, Thailand, 11(3), pp. 149–153. available at: https://he02.tci-thaijo.org/index.php/tjog/article/view/257132 (accessed: 29 September 2026).