Geodesic
Spherical Diagrams and Indentities Among Relations.
Mathematische Annalen, Tome 261 (1982), pp. 155-184.

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     author = {D.J. Collins and J. Huebschmann},
     title = {Spherical {Diagrams} and {Indentities} {Among} {Relations.}},
     journal = {Mathematische Annalen},
     pages = {155--184},
     publisher = {mathdoc},
     volume = {261},
     year = {1982},
     zbl = {0477.20019},
     url = {http://geodesic.mathdoc.fr/item/MAN_1982__261_182872/}
}
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D.J. Collins; J. Huebschmann. Spherical Diagrams and Indentities Among Relations.. Mathematische Annalen, Tome 261 (1982), pp. 155-184. http://geodesic.mathdoc.fr/item/MAN_1982__261_182872/