Sharifzadeh,F , , Abbasi Dezfouli,G , , Moeini Chaghervand,M , and Azad,Z . "Comparison of the efficacy of Glyceryl trinitrate and Misoprostol on cervical ripening for curretage in pregnant women at first trimester", The Iranian Journal of Obstetrics, Gynecology and Infertility, 18, 174, 2015, 6-11. doi: 10.22038/ijogi.2015.6371