1. Basis of the horizontal–vertical illusion;Avery;Journal of Experimental Psychology,1969
2. Untersuchungen über die scheinbare Grösse im Sehraume;Blumenfeld;Zeitschrift für Psychologie und Physiologie der Sinnesorgane,1913
3. Sensation and perception in the history of experimental psychology;Boring,1942
4. Geometrical illusions and the response of neurones in the cat’s visual cortex to angle patterns;Burns;Journal Physiology,1971
5. Hyperbolic geometry;Cannon,1997