@article{JMLR:v9:maurer08a,
  author  = {Andreas Maurer},
  title   = {Learning Similarity with Operator-valued Large-margin Classifiers},
  journal = {Journal of Machine Learning Research},
  year    = {2008},
  volume  = {9},
  number  = {36},
  pages   = {1049--1082},
  url     = {http://jmlr.org/papers/v9/maurer08a.html}
}