著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) NOVIKOVA N,Effectiveness of levonorgestrel emergency contraception given before or after ovulation--a pilot study,Contraception,,,2007,75,,112-118,https://cir.nii.ac.jp/crid/1573387451185794432,