@article{JEMS_2008_10_2_a7,
     author = {Margarida Mendes Lopes and Rita Pardini},
     title = {Numerical {Campedelli} surfaces with fundamental group of order 9},
     journal = {Journal of the European Mathematical Society},
     pages = {457--476},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {2008},
     doi = {10.4171/jems/118},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/118/}
}