@article{oai:ismrepo.ism.ac.jp:00032361,
 author = {清水, 良一 and Shimizu, Ryoichi},
 issue = {2},
 journal = {統計数理研究所彙報},
 month = {Dec},
 pages = {147--165},
 title = {一般超幾何分布},
 volume = {16},
 year = {1968}
}