@article{umezawa_takeuchi_yamazaki_nitta_osawa_umezawa_1959, 
  title={Biological Studies on Kanamycin-Di-N- and Tetra-N-Methanesulfonates and Fradiomycin (Neomycin)-N-Methanesulfonate}, 
  volume={12}, 
  DOI={10.11554/antibioticsa.12.4_117}, 
  number={4}, 
  publisher={Japan Antibiotics Research Association}, 
  author={Umezawa, Hamao and Takeuchi, Tomio and Yamazaki, Seirō and Nitta, Kazuo and Osawa, Tomoko and Umezawa, Sumio}, 
  year={1959}
  }