@article{soktrainingmachinelearningmodelsover,
  title = {SoK: Training Machine Learning Models over Multiple Sources with Privacy Preservation},
  author = {Lushan Song and Guopeng Lin and Jiaxuan Wang and Haoqi Wu and Wenqiang Ruan and Weili Han},
  year = {2020},
  eprint = {2012.03386},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2012.03386v2},
}