1. Attneave, F.: Three approaches to perceptual Organisation: Comments on views of Hochberg, Shepard, Shaw and Turvey. In: Kubovy, M., Pomerantz, J.R. (Hrsg.): Perceptual Organisation. Hillsdale: N.J. Lawrence Erlbaum Ass., 1981, pp. 414–421.
2. Abravanel, E.: Active detection of solide-shape information by touch and vision. Perception & Psychophysics 10: 358–360, 1971.
3. Bean, C.H.: The blind have „optical illusions“. Journal of Experimental Psychology 22:283–289,1938.
4. Becker, J.: Über taktilmotorische Figurwahrnehmung. Psychologische Forschung 20:102–158, 1935.
5. von Békésy, G.: Neuronal inhibitory units of the eye and skin: Qualitative description of contrast phenomena. Journal of the Optical Society of America 50:1060–1070, 1960.