@article{kobayashi1957,
  title={Pion Prodution in Nucleon-Nucleon Collisions in Bev Range},
  author={Tetsuro Kobayashi},
  year={1957},
  journal={Progress of Theoretical Physics},
  doi={10.1143/ptp.18.318},
  url={https://doi.org/10.1143/ptp.18.318}
}