Paper  bibtex   

@article{forbus2004open,
  title={Open-domain sketch understanding: The nuSketch approach},
  author={Forbus, K and Lockwood, Kate and Klenk, Matthew and Tomai, Emmett and Usher, Jeffrey},
  booktitle={AAAI Fall Symposium on Making Pen-based Interaction Intelligent and Natural},
  pages={58--63},
  year={2004},
  %venuetype = {Workshop},
  url={http://matthewklenk.com/papers/nuSketchCG05v7KDF.pdf}
}