@article{oai:hokkyodai.repo.nii.ac.jp:00008254,
 author = {久保, 良宏 and 牧野, 宏 and 森, 照明},
 issue = {8},
 journal = {日本数学教育学会誌},
 month = {Aug},
 pages = {2--12},
 title = {戦後の我が国における小学生の算数の達成度の特徴と変化},
 volume = {87},
 year = {2005}
}