Groupoids and crossed objects in algebraic topology.
Brown, Ronald
Homology, Homotopy and Applications, Tome 1 (1999), p. 1-78 / Harvested from The Electronic Library of Mathematics
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Publié le : 1999-01-01
EUDML-ID : urn:eudml:doc:228077 
@article{01285145,
     title = {Groupoids and crossed objects in algebraic topology.},
     journal = {Homology, Homotopy and Applications},
     volume = {1},
     year = {1999},
     pages = {1-78},
     zbl = {0920.55002},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01285145}
}

Brown, Ronald. Groupoids and crossed objects in algebraic topology.. Homology, Homotopy and Applications, Tome 1 (1999) pp. 1-78. http://gdmltest.u-ga.fr/item/01285145/