Watt, R.J. (1990). "The primal sketch in human vision". In Blake, Andrew; Troscianko, Tom (eds.). AI and the eye. European Conference on Visual Perception. New York: J. Wiley & Sons. pp. 147–180. ISBN0-471-92194-7. OCLC20995610.
Watt, R.J. (1990). "The primal sketch in human vision". In Blake, Andrew; Troscianko, Tom (eds.). AI and the eye. European Conference on Visual Perception. New York: J. Wiley & Sons. pp. 147–180. ISBN0-471-92194-7. OCLC20995610.