@article{miyamoto1970,
  title={Invariance Properties of Propertime Formulation of Dual Resonance Model},
  author={Yoneji Miyamoto},
  year={1970},
  journal={Progress of Theoretical Physics},
  doi={10.1143/ptp.43.1620},
  url={https://doi.org/10.1143/ptp.43.1620}
}