@article{oai:ismrepo.ism.ac.jp:00032110,
 author = {青山, 博次郎 and Aoyama, Hirojiro},
 issue = {2},
 journal = {統計数理研究所彙報},
 month = {Mar},
 pages = {41--45},
 title = {層別抽出法に於ける相関係数の推定},
 volume = {1},
 year = {1954}
}