Last but Not Least

Coren S , Girgus J S , 1972 “A comparison of five methods of illusion measurement” Behavioral Research Methods and Instruments 4 240–244

Coren S , Girgus J S , Erlichman H , Hakstian A R , 1976 “An empirical taxonomy of visual illusions” Perception & Psychophysics 20 129–137

Gregory R L Gombrich E H (Eds), 1973 Illusion in Nature and Art (London: Duckworth)

Imai S , 1982 “A factor analysis of visual illusions” Tokyo Metropolitan University Journal of Social Sciences & Humanities (Jinbun Gakuhou) 152 1–18, in Japanese with an English abstract