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

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