no. 3
Centralizers in action accessible categories
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 50 (2009) no. 3, article no. 3, 22 p. 
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     pages = {211--232},
     publisher = {Andr\'ee CHARLES EHRESMANN},
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     zbl = {1187.18011},
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Bourn, Dominique; Janelidze, George. Centralizers in action accessible categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 50 (2009) no. 3, article  no. 3, 22 p. http://www.numdam.org/item/CTGDC_2009__50_3_211_0/

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