@article{oai:ismrepo.ism.ac.jp:00033046,
 author = {門山, 充 and Kadoyama, Makoto},
 issue = {9},
 journal = {統計数理研究所講究録},
 month = {Dec},
 pages = {364--366},
 title = {E(X/Y)=EX/EYとなるための一つの充分條件},
 volume = {4},
 year = {1948}
}