Baer invariants in semi-abelian categories II: Homology

T. Everaert and T. Van der Linden, Baer invariants in semi-abelian categories II: Homology, Theory Appl. Categ. 12 (2004), no. 4, 195-224.

A more direct proof of the Hopf formula (Theorem 6.9), which avoids the use of model categories, is given in the paper

T. Everaert, M. Gran and T. Van der Linden, Higher Hopf formulae for homology via Galois Theory, Adv. Math. 217 (2008), 2231-2267

and in subsequent work of Tomas Everaert and Julia Goedecke.

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