@article{oai:repository.dl.itc.u-tokyo.ac.jp:00030134,
 author = {三木, 安正 and 天羽, 幸子},
 journal = {東京大学教育学部紀要},
 month = {Dec},
 pages = {3--59},
 title = {双生児のいる学級集団},
 volume = {1},
 year = {1956}
}