(1)
Virutamasen, P.; Reinprayoon, D.; Wongwathanavikrom, R.; Nitichai , Y.; Nilakarn, T.; Poomsuwan, P. Clinical and Metabolic Study of Triphasic Contraceptive Pill (Triquilar)®. Thai J Obstet Gynaecol 1989, 1, 31-38.