@article{yamakawa_sakamoto_2013, 
  title={The study on classification of excuses using KJ method and questionnaire survey}, 
  volume={77}, 
  DOI={10.4992/pacjpa.77.0_2ev-017}, 
  publisher={The Japanese Psychological Association}, 
  author={YAMAKAWA, Itsuki and SAKAMOTO, Shinji}, 
  year={2013}, 
  month={Sep}
  }