Momenzadeh, F., Toghiri, M. A., Taghizadeh, M., Mahlioji, M., & Rafiee, F. "Comparison the Effect of Fennel and Mefenamic Acid on Severity of Primary Dysmenorrhea", The Iranian Journal of Obstetrics, Gynecology and Infertility, 20, 4, 2017, 44-49. doi: 10.22038/ijogi.2017.8981