Freeness conditions for 2-crossed modules and complexes. Mutlu, A.; Porter, T. — 1998 Theory and Applications of Categories [electronic only]
Applications of Peiffer pairings in the Moore complex of a simplicial group. Mutlu, A.; Porter, T. — 1998 Theory and Applications of Categories [electronic only]
Free crossed resolutions from simplicial resolutions with given C W -basis A. Mutlu; T. Porter — 1999 Cahiers de Topologie et Géométrie Différentielle Catégoriques