@article{hardnessofsamplesisallyouneed,
  title = {HODA: Hardness-Oriented Detection of Model Extraction Attacks},
  author = {Amir Mahdi Sadeghzadeh and Amir Mohammad Sobhanian and Faezeh Dehghan and Rasool Jalili},
  year = {2021},
  eprint = {2106.11424},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2106.11424v2},
}