Relatively boolean and De Morgan toposes and locales
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 35 (1994) no. 3, pp. 249-261. 
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     title = {Relatively boolean and {De} {Morgan} toposes and locales},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {249--261},
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     volume = {35},
     number = {3},
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     mrnumber = {1295120},
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     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1994__35_3_249_0/}
}
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Kock, Anders; Reyes, Gonzalo E. Relatively boolean and De Morgan toposes and locales. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 35 (1994) no. 3, pp. 249-261. http://www.numdam.org/item/CTGDC_1994__35_3_249_0/

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