8Davis AR, Westhff CL. Primary dysmenorrhea in adolecent girls and treatment with oral contraceptives [J ] .J Pediatr Adolese Gynecol,2001; 14: 3-7.
9Hillen TI. Primary dysmeorrhea in young western Austraulian women:Prevalance, Impact and knowledge of treatment [J] .J of Adolescent Health, 1999; 25 (1): 40-45.