@article{oai:soar-ir.repo.nii.ac.jp:00017615,
 author = {NISHIKAWA,  Akira},
 journal = {信州大学教養部紀要. 第二部, 自然科学},
 month = {Mar},
 note = {Article, 信州大学教養部紀要. 第二部, 自然科学 8: 1-4(1974)},
 pages = {1--4},
 title = {A Note on the Dimension Subgroups},
 volume = {8},
 year = {1974}
}