Pengsaa, Prasit, Banchong Udomthavornsuk, and Axel Hemfling. 1990. “Prognostic Factors for Survival after Surgery for Early Stages Cervical Cancer”. Thai Journal of Obstetrics and Gynaecology 2 (1). Bangkok, Thailand:29-36. https://he02.tci-thaijo.org/index.php/tjog/article/view/257897.