@article{efficientregularizedleastsquares,
  title = {Efficient Regularized Least-Squares Algorithms for Conditional Ranking on Relational Data},
  author = {Tapio Pahikkala and Antti Airola and Michiel Stock and Bernard De Baets and Willem Waegeman},
  year = {2012},
  eprint = {1209.4825},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1209.4825v2},
}