@article{oai:repository.dl.itc.u-tokyo.ac.jp:00017924,
 author = {Nakagiri, Shigeru},
 issue = {9},
 journal = {生産研究},
 month = {Sep},
 pages = {674--677},
 title = {研究速報 : A note Possible Natural Frequencies of In-plane Swing of a Hanging Chain},
 volume = {51},
 year = {1999}
}