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Categorical structures enriched in a quantaloid : regular presheaves, regular semicategories Isar Stubbe (2005) Cahiers de Topologie et Géométrie Différentielle Catégoriques
Categorical structures enriched in a quantaloid: tensored and cotensored categories. Stubbe, Isar (2006) Theory and Applications of Categories [electronic only]
Covariant presheaves and subalgebras. Höhle, Ulrich (2011) Theory and Applications of Categories [electronic only]