@article{oai:air.repo.nii.ac.jp:00005086,
 author = {森川, 幾太郎 and MORIKAWA, Ikutaro},
 issue = {21},
 journal = {東北数学教育学会年報, Journal of Tohoku Society of Mathematics Education},
 month = {Mar},
 pages = {17--28},
 title = {数の乗法的構造を生かしての加減計算},
 year = {1990}
}