@article{10_4064_cm99_2_4,
     author = {Mike Prest and Robert Wisbauer},
     title = {Finite presentation and purity in categories $\sigma [M]$},
     journal = {Colloquium Mathematicum},
     pages = {189--202},
     publisher = {mathdoc},
     volume = {99},
     number = {2},
     year = {2004},
     doi = {10.4064/cm99-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm99-2-4/}
}