Baer invariants in semi-abelian categories II: Homology. Everaert, T.; Van der Linden, T. — 2004 Theory and Applications of Categories [electronic only]
Baer invariants in semi-abelian categories I: General theory. Everaert, T.; Van der Linden, T. — 2004 Theory and Applications of Categories [electronic only]
Model structures for homotopy of internal categories. Everaert, T.; Kieboom, R.W.; Van der Linden, T. — 2005 Theory and Applications of Categories [electronic only]