Description | 'Mr S. Bidwell:- "Recurrent Images following Visual Suppressions", Roy. Soc. Proc. [Proceedings of the Royal Society], Vol. 56, figs. 1 and 3 (pp. 135 & 143) ditto - "Subjective Colour Phenomena", Roy. Soc. Proc., vol. 60, fig. on p. 369
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