Craig, Eugene A.; Lichtenstein, M. (1953). "Visibility-Invisibility Cycles as a Function of Stimulus-Orientation". The American Journal of Psychology. 66 (4): 554–563. doi:10.2307/1418951. JSTOR1418951. PMID13124563.
Nachman, Adrian I. (November 1988). "Reconstructions From Boundary Measurements". Annals of Mathematics. 128 (3): 531–576. doi:10.2307/1971435. JSTOR1971435.
Craig, Eugene A.; Lichtenstein, M. (1953). "Visibility-Invisibility Cycles as a Function of Stimulus-Orientation". The American Journal of Psychology. 66 (4): 554–563. doi:10.2307/1418951. JSTOR1418951. PMID13124563.
Nachman, Adrian I. (November 1988). "Reconstructions From Boundary Measurements". Annals of Mathematics. 128 (3): 531–576. doi:10.2307/1971435. JSTOR1971435.
Craig, Eugene A.; Lichtenstein, M. (1953). "Visibility-Invisibility Cycles as a Function of Stimulus-Orientation". The American Journal of Psychology. 66 (4): 554–563. doi:10.2307/1418951. JSTOR1418951. PMID13124563.