@article{oai:ismrepo.ism.ac.jp:00033162,
 author = {石田, 正次 and Isida, Masatugu},
 issue = {4},
 journal = {統計数理研究所講究録},
 month = {Jul},
 pages = {172--179},
 title = {ある層化法に就いて(II)},
 volume = {6},
 year = {1950}
}