@article{CTT100667919,
  author = {W. Li and Y. Niimi and Y. Orino and S. Hirata and M. K. Kurosawa},
  title = {A frequency synchronization method for a self-oscillating PWM signal generator},
  journal = {IEEE Transactions on Circuits and Systems II: Express Briefs},
  year = 2014,
}

@inproceedings{CTT100587064,
  author = {Yoshitaka Niimi and yuichiro orino and Minoru Kuribayashi Kurosawa and Takashi Katagiri},
  title = {ΔΣ変調を用いたキャリア変調方式PWM 変換の検討},
  booktitle = {電子情報通信学会総合大会講演論文集},
  year = 2008,
}