@article{JMLR:v8:reisert07a,
  author  = {Marco Reisert and Hans Burkhardt},
  title   = {Learning Equivariant Functions with Matrix Valued Kernels},
  journal = {Journal of Machine Learning Research},
  year    = {2007},
  volume  = {8},
  number  = {15},
  pages   = {385--408},
  url     = {http://jmlr.org/papers/v8/reisert07a.html}
}