@inproceedings{morariu08figtree
  author    = {Vlad I. Morariu and Balaji Vasan Srinivasan and 
               Vikas C. Raykar and Ramani Duraiswami and Larry S. Davis},
  title     = {Automatic online tuning for fast Gaussian summation},
  booktitle = {Advances in Neural Information Processing Systems (NIPS)}
  year      = {2008}
}