@article{JMLR:v8:cardoso07a,
  author  = {Jaime S. Cardoso and Joaquim F. Pinto da Costa},
  title   = {Learning to Classify Ordinal Data: The Data Replication Method},
  journal = {Journal of Machine Learning Research},
  year    = {2007},
  volume  = {8},
  number  = {50},
  pages   = {1393--1429},
  url     = {http://jmlr.org/papers/v8/cardoso07a.html}
}