Jutta Schumann and Thomas Strothotte and Andreas Raab and Stefan Laser.
Assessing the Effect of Non-Photorealistic Rendered Images in CAD.
In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems: Common Ground, pp. 35--41, 1996.

Bibtex:

@InProceedings{ schumann:1996:AENR,
  author = 	"Jutta Schumann and Thomas Strothotte and Andreas Raab
                  and Stefan Laser",
  title = 	"Assessing the Effect of Non-Photorealistic Rendered
                  Images in CAD",
  booktitle = 	"Proceedings of the SIGCHI Conference on Human Factors
                  in Computing Systems: Common Ground",
  pages = 	"35--41",
  year = 	"1996",
}

Images: