Geodesic
Freeness Conditions for 2-Crossed Modules and Complexes
Theory and applications of categories, Tome 4 (1998), pp. 174-194 
A. Mutlu; T. Porter. Freeness Conditions for 2-Crossed Modules and Complexes. Theory and applications of categories, Tome 4 (1998), pp. 174-194. http://geodesic.mathdoc.fr/item/TAC_1998_4_a7/
@article{TAC_1998_4_a7,
     author = {A. Mutlu and T. Porter},
     title = {Freeness {Conditions} for {2-Crossed} {Modules} and {Complexes}},
     journal = {Theory and applications of categories},
     pages = {174--194},
     year = {1998},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_1998_4_a7/}
}
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Voir la notice de l'article provenant de la source Theory and Applications of Categories website

Using free simplicial groups, it is shown how to construct a free or totally free 2-crossed module on suitable construction data. 2-crossed complexes are introduced and similar freeness results for these are discussed.

Please note the electronically available References at http://www.tac.mta.ca/tac/volumes/1998/n8/reference.html