@article{nagai_nakagawa_1936, 
  title={STUDIES ON MIXING BENTONITE TO PORTLAND CEMENT, PART I}, 
  volume={44}, 
  DOI={10.2109/jcersj1892.44.385}, 
  number={522}, 
  publisher={Ceramic Society of Japan}, 
  author={Nagai and Nakagawa}, 
  year={1936}
  }