@inproceedings{MVA2013-PerspectiveSelection,
  author    = {Frank Nielsen},
  title     = {Perspective click-and-drag area selections in pictures},
  booktitle = {Proceedings of the 13. {IAPR} International Conference on Machine
               Vision Applications, {MVA} 2013, Kyoto, Japan, May 20-23, 2013},
  year      = {2013},
  pages     = {29--32} 
}