@article{oguchi1961,
  title={The Equivalence of Hamiltonians of Holstein-Primakoff and Dyson in Spin-Wave Theory in Ferromagnetism},
  author={Takehiko Oguchi},
  year={1961},
  journal={Progress of Theoretical Physics},
  doi={10.1143/ptp.25.721},
  url={https://doi.org/10.1143/ptp.25.721}
}