@article{semisupervisedordinalregressionbasedon,
  title = {Semi-Supervised Ordinal Regression Based on Empirical Risk Minimization},
  author = {Taira Tsuchiya and Nontawat Charoenphakdee and Issei Sato and Masashi Sugiyama},
  year = {2019},
  eprint = {1901.11351},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1901.11351v3},
}