@article{JMLR:v10:jain09a,
  author  = {Brijnesh J. Jain and Klaus Obermayer},
  title   = {Structure Spaces},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {93},
  pages   = {2667-2714},
  url     = {http://jmlr.org/papers/v10/jain09a.html}
}