@article{oai:niigata-u.repo.nii.ac.jp:00028980,
 author = {清野, 佳子},
 issue = {2},
 journal = {数学教育研究, 数学教育研究},
 month = {Oct},
 pages = {36--43},
 title = {加法・減法の意味理解を深める図的表現の指導},
 volume = {44},
 year = {2009}
}