@article{oai:ismrepo.ism.ac.jp:00033258,
 author = {Hiraga, Yoshihiko},
 issue = {12},
 journal = {統計数理研究所講究録},
 month = {Mar},
 pages = {485--486},
 title = {On a Generalization of a Theorem by Liapounoff(第一部)},
 volume = {7},
 year = {1952}
}