@article{anadaptiveperiodicdisturbanceobserverfor,
  title = {An Adaptive Periodic-Disturbance Observer for Periodic-Disturbance Suppression},
  author = {Hisayoshi Muramatsu and Seiichiro Katsura},
  year = {2020},
  eprint = {2004.00487},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2004.00487v2},
}