@article{oai:soar-ir.repo.nii.ac.jp:00012870,
 author = {SAKAI,  Yuji},
 journal = {信州大学工学部紀要},
 month = {Dec},
 note = {Article, 信州大学工学部紀要 49: 13-22 (1980)},
 pages = {13--22},
 title = {Decreasing Rearrangements of Non-Negative (C₀) Sequences and Some Extensions of Hardy-Littlewood-Pólya's Theorems},
 volume = {49},
 year = {1980}
}