@article{TAC_2010_23_a12,
     author = {J. Adamek and J. Rosicky and E. M. Vitale},
     title = {What are sifted colimits?},
     journal = {Theory and applications of categories},
     pages = {251--260},
     year = {2010},
     volume = {23},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2010_23_a12/}
}