no. 2
The internal and external aspect of logic and set theory in elementary topoi
Cahiers de topologie et géométrie différentielle, Tome 15 (1974) no. 2, pp. 157-180. 
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     title = {The internal and external aspect of logic and set theory in elementary topoi},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
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     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {15},
     number = {2},
     year = {1974},
     mrnumber = {387049},
     zbl = {0362.18001},
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     url = {http://www.numdam.org/item/CTGDC_1974__15_2_157_0/}
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Osius, Gerhard. The internal and external aspect of logic and set theory in elementary topoi. Cahiers de topologie et géométrie différentielle, Tome 15 (1974) no. 2, pp. 157-180. http://www.numdam.org/item/CTGDC_1974__15_2_157_0/

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