Preutthipan, S., Amso, N., & Shaw, R. W. (1996). A Prospective Randomized Trial Comparing Urinary Luteinizing Hormone and Basal Body Temperature Graphs for Timed Sexual Intercourse in Unexplained lnfertility. Thai Journal of Obstetrics and Gynaecology, 8(4), 339–342. retrieved from https://he02.tci-thaijo.org/index.php/tjog/article/view/92611