@article{加藤_1938, 
  title={正係數ヲ有スル代數方程式ノ根ノ存在範圍ニ就テ}, 
  volume={20}, 
  DOI={10.32296/jjsmet.20.4_197}, 
  number={4}, 
  publisher={Japan Society of Mathematical Education (Mathematical Association of Japan for Secondary Education)}, 
  author={加藤, 精一}, 
  year={1938}
  }