@article{10_4171_dm_333,
     author = {Thomas M. Fiore and Wolfgang L\"uck and Roman Sauer},
     title = {Euler characteristics of categories and homotopy colimits},
     journal = {Documenta mathematica},
     pages = {301--354},
     year = {2011},
     volume = {16},
     doi = {10.4171/dm/333},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/333/}
}