@article{TAC_2006_16_a26,
     author = {Emmanuel Haucourt},
     title = {Categories of components and loop-free categories},
     journal = {Theory and applications of categories},
     pages = {736--770},
     publisher = {mathdoc},
     volume = {16},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2006_16_a26/}
}