@article{aprivacypreservingcontentbasedimage,
  title = {A Privacy-Preserving Content-Based Image Retrieval Scheme Allowing Mixed Use Of Encrypted And Plain Images},
  author = {Kenta Iida and Hitoshi Kiya},
  year = {2020},
  eprint = {2011.00270},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2011.00270v1},
}