@article{TAC_2005_15_a2,
     author = {T. Everaert and R.W. Kieboom and T. Van der Linden},
     title = {Model structures for homotopy of internal categories},
     journal = {Theory and applications of categories},
     pages = {66--94},
     publisher = {mathdoc},
     volume = {15},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2005_15_a2/}
}