@article{sagawa_1993, 
  title={自作 pH 計と滴下量測定装置による滴定曲線}, 
  volume={41}, 
  DOI={10.20665/kakyoshi.41.4_272}, 
  number={4}, 
  publisher={The Chemical Society of Japan}, 
  author={SAGAWA, Hirozi}, 
  year={1993}
  }