@article{10_4153_CMB_2009_030_5,
     author = {MacDonald, John and Scull, Laura},
     title = {Amalgamations of {Categories}},
     journal = {Canadian mathematical bulletin},
     pages = {273--284},
     year = {2009},
     volume = {52},
     number = {2},
     doi = {10.4153/CMB-2009-030-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2009-030-5/}
}