@article{10_4171_dm_240,
     author = {Tom Leinster},
     title = {The {Euler} characteristic of a category},
     journal = {Documenta mathematica},
     pages = {21--49},
     year = {2008},
     volume = {13},
     doi = {10.4171/dm/240},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/240/}
}