@article{okada_kato_2002, 
  title={P/O(花粉数/胚珠数)比より推定したカワゴケソウ科数種の送粉様式}, 
  volume={2}, 
  DOI={10.18942/bunrui.kj00003560086}, 
  number={2}, 
  publisher={Japanese Society for Plant Systematics}, 
  author={Okada, H. and Kato, M.}, 
  year={2002}
  }