Quotient systems in Grothendieck topoi
Cahiers de topologie et géométrie différentielle, Tome 23 (1982) no. 4, pp. 425-438. 
@article{CTGDC_1982__23_4_425_0,
     author = {Rosenthal, Kimmo I.},
     title = {Quotient systems in {Grothendieck} topoi},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {425--438},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {23},
     number = {4},
     year = {1982},
     mrnumber = {693508},
     zbl = {0521.18005},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1982__23_4_425_0/}
}
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Rosenthal, Kimmo I. Quotient systems in Grothendieck topoi. Cahiers de topologie et géométrie différentielle, Tome 23 (1982) no. 4, pp. 425-438. http://archive.numdam.org/item/CTGDC_1982__23_4_425_0/

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