@article{oai:niigata-u.repo.nii.ac.jp:00028991,
 author = {川又, 由香},
 issue = {2},
 journal = {数学教育研究, 数学教育研究},
 month = {Oct},
 pages = {17--22},
 title = {演算決定における数直線図の活用について},
 volume = {43},
 year = {2008}
}