@InProceedings {Alvarado2004Sketch,
  author =       {Christine Alvarado},
  title =        {Sketch Recognition User Interfaces: Guidelines for Design and Development},
  booktitle =    {Making Pen-Based Interaction Intelligent and Natural},
  year =         {2004},
  publisher =    {AAAI Fall Symposium},
  OPTkeyword =   {general sketch recognition}
}