@article{宝津_1990, 
  title={4. 機械力学 4・1 総論 (<特集>機械工学年鑑 "JSME Year Book")}, 
  volume={93}, 
  DOI={10.1299/jsmemag.93.861_648_1}, 
  number={861}, 
  publisher={The Japan Society of Mechanical Engineers}, 
  author={宝津, 義定}, 
  year={1990}
  }