1. Ballard, D. H., Hilton, G. E., & Sejnowski, T. J. (1983). Parallel visual computation, Nature,306, 21–26.
2. Bassi, C. J. (1989). Parallel processing in the human visual system. In M. Wall, & A. A. Sadun (Eds.), New methods of sensory visual testing (pp. 1–13). New York: Springer-Verlag.
3. Benedict, M. L. (1979). To take hold of space: Isovists and isovists fields. Environment and Planning B, 6,47–65.
4. Gibson, J. J. (1966). The senses Considered as perceptual systems. Boston: Houghton-Mifflin.
5. Gibson, J. J. (1979). The ecological approach to visual perception. Boston: Houghton-Mifflin.