Factorization theorems for geometric morphisms, I
Cahiers de topologie et géométrie différentielle, Tome 22 (1981) no. 1, pp. 3-17.
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     author = {Johnstone, P. T.},
     title = {Factorization theorems for geometric morphisms, {I}},
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     volume = {22},
     number = {1},
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     url = {http://www.numdam.org/item/CTGDC_1981__22_1_3_0/}
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Johnstone, P. T. Factorization theorems for geometric morphisms, I. Cahiers de topologie et géométrie différentielle, Tome 22 (1981) no. 1, pp. 3-17. http://www.numdam.org/item/CTGDC_1981__22_1_3_0/

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