Robert C. Zeleznik and Kenneth P. Herndon and John F. Hughes.
SKETCH: An Interface for Sketching 3D Scenes.
In Computer Graphics, Proceedings of Siggraph 1996, pp. 163--170, 1996.

Bibtex:

@InProceedings{ zeleznik:1996:SISS,
  author = 	"Robert C. Zeleznik and Kenneth P. Herndon and John F. Hughes",
  title = 	"SKETCH: An Interface for Sketching 3D Scenes",
  booktitle = 	"Computer Graphics, Proceedings of Siggraph 1996",
  pages = 	"163--170",
  year = 	"1996",
}

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