Reference links from
Freeness Conditions for 2-Crossed Modules and Complexes
A. Mutlu and T. Porter,
Applications of Peiffer pairings in the Moore complex of a simplicial group,
Theory and Applications of Categories, 4(1998), 148-173, Available via
http://www.tac.mta.ca/tac/
or
ftp://ftp.tac.mta.ca/pub/tac/html/volumes/1998/n7/n7.dvi
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