@article{oai:juen.repo.nii.ac.jp:00006997,
 author = {伊達, 文治 and Date, Fumiharu},
 issue = {30},
 journal = {上越教育大学数学研究, Joetsu journal of mathematics education},
 month = {Mar},
 pages = {13--22},
 title = {三角法と対数の教材に関する史的考察},
 year = {2015},
 yomi = {ダテ, フミハル}
}