Fast anisotropic gauss filtering

@Article\{GSV2003,
  author       = "Jan-Mark Geusebroek and Arnold W.M. Smeulders and Joost van de Weijer",
  title        = "Fast anisotropic gauss filtering",
  journal      = "IEEE Transactions on Image Processing",
  number       = "8",
  volume       = "12",
  pages        = "938--943",
  month        = "aug",
  year         = "2003",
  ifactor      = "2.642",
  quartile     = "Q1",
  area         = "Computer Sci. Artificial Int.",
  url          = "http://cat.cvc.uab.es/Public/Publications/2003/GSV2003"
}