Pongsuthirak, P., Oranratnachai, A., Vutyavanich, T., Jongyusuk, P., Uttavichai, C., Ittipunkul, W., Wongtra-ngan, S. and Piromletamorn, W. 1993. Comparison of Long and Short GnRH-a/hMG Ovarian Stimulation Protocols in Assisted Reproduction . Thai Journal of Obstetrics and Gynaecology. 5, 2 (Jul. 1993), 91–98.