@article{tanaka_yokoyama_1959, 
  title={Network Formation in Polyurethane.}, 
  volume={62}, 
  DOI={10.1246/nikkashi1898.62.12_1942}, 
  number={12}, 
  publisher={The Chemical Society of Japan}, 
  author={Tanaka and Yokoyama}, 
  year={1959}
  }