@article{CTT100617612,
  author = {北田亮平 and 赤木泰文},
  title = {複数台の双方向絶縁形DC/DCコンバータを用いたマルチレベル・カスケードBTBシステムの制御法},
  journal = {電気学会産業応用部門誌},
  year = 2010,
}

@inproceedings{CTT100642358,
  author = {Hirofumi Akagi and Ryohei Kitada},
  title = {Control and Design of a Modular Multilevel Cascade BTB System Using Bidirectional Isolated DC/DC Converters},
  booktitle = {IEEE Transactions on Power Electronics},
  year = 2011,
}