Okamoto, E., M. Demizugawa, Y. Otsuki, T. Takagi, N. Mitsuda, and O. Tanizawa. “Study of Immunoreactive 8-Arginine Vasopressin in Human Plasma During Pregnancy and at Delivery : Utilization of a Highly Sensitive Radioimmunoassay with a Reversed Phase C18 Silica Column”. Thai Journal of Obstetrics and Gynaecology, vol. 4, no. 2, July 1992, pp. 89-98, https://he02.tci-thaijo.org/index.php/tjog/article/view/257829.