@techreport{oai:jaxa.repo.nii.ac.jp:00044250,
 author = {川井, 忠彦 and 塙, 武敏 and KAWAI, Tadahiko and HANAWA, Taketoshi},
 month = {May},
 note = {資料番号: NALTR0012000, レポート番号: NAL TR-12},
 title = {薄肉開断面梁の自由振動について},
 year = {1961}
}