1. Simplicial T-complexes and crossed complexes;Ashley,1978
2. Algebraic Homotopy;Baues,1988
3. Combinatorial Homotopy and 4-Dimensional Complexes;Baues,1991
4. On the tensor algebra of a non-abelian group and applications;Bauer;K-theory,1992
5. Coproducts of crossed P-modules: Applications to second homotopy groups and to the homology of groups;Brown;Topology,1984