@article{GMJ_2002__9_4_50442,
     author = {Garz\'on, A.R. and del R{\'\i}o, A.},
     title = {The {Whitehead} categorical group of derivations.},
     journal = {Georgian Mathematical Journal},
     pages = {709--721},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2002},
     zbl = {1027.18004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_2002__9_4_50442/}
}