References
Adelson E H, 2000 "Lightness perception and lightness illusion", in The New Cognitive Neurosciences 2nd edition, Ed. M S Gazzaniga (Cambridge, MA: MIT Press) pp 339 – 351
Koffka K, 1935 Principles of Gestalt Psychology (London: Lund Humphries)
Köhler W, 1930 Gestalt Psychology (London: G Bell & Sons)
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DOIs retrieved