@article{TAC_2008_21_a10,
     author = {J. Adamek and J. Velebil},
     title = {Analytic functors and weak pullbacks},
     journal = {Theory and applications of categories},
     pages = {191--209},
     publisher = {mathdoc},
     volume = {21},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2008_21_a10/}
}