@article{nagahori_1989, 
  title={Subsurface Drainage}, 
  volume={1989}, 
  DOI={10.11408/jierp1982.1989.16_42}, 
  number={16}, 
  publisher={The Japanese Society of Irrigation, Drainage and Rural Engineering}, 
  author={NAGAHORI, Kinzo}, 
  year={1989}
  }