@article{JMLR:v6:drineas05a,
  author  = {Petros Drineas and Michael W. Mahoney},
  title   = {On the Nystrom Method for Approximating a Gram Matrix for Improved Kernel-Based Learning},
  journal = {Journal of Machine Learning Research},
  year    = {2005},
  volume  = {6},
  number  = {72},
  pages   = {2153--2175},
  url     = {http://jmlr.org/papers/v6/drineas05a.html}
}