@inproceedings{ordinalnonnegativematrixfactorizationfor,
  title = {Ordinal Non-negative Matrix Factorization for Recommendation},
  author = {Olivier Gouvert and Thomas Oberlin and Cédric Févotte},
  year = {2020},
  booktitle = {ICML 2020 1},
  eprint = {2006.01034},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2006.01034v4},
}