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  1. Topos Theory.P. T. Johnstone - 1982 - Journal of Symbolic Logic 47 (2):448-450.
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  • Toposes and Local Set Theories. An Introduction.J. L. Bell - 1990 - Journal of Symbolic Logic 55 (2):886-887.
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  • Mathematical logic and Hilbert's & symbol.A. C. Leisenring - 1969 - London,: Macdonald Technical & Scientific.
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