Weak cofibrations in categories of cofibrant objects. Kieboom, R.W., Sonck, G., Van der Linden, T., Witbooi, P.J. (2003) Homology, Homotopy and Applications
What to embed into a Cartesian closed topological category (Preliminary communication) Jiří Adámek, Václav Koubek (1977) Commentationes Mathematicae Universitatis Carolinae
When is Ω a cogenerator in a topos ? Francis Borceux (1975) Cahiers de Topologie et Géométrie Différentielle Catégoriques
When projective does not imply flat, and other homological anomalies. Lewis, Gaunce L.jun. (1999) Theory and Applications of Categories [electronic only]