@article{10_5427_jsing_2012_4i,
     author = {John Brevik and Scott Nollet},
     title = {Picard groups of normal surfaces},
     journal = {Journal of Singularities},
     pages = {154--170},
     publisher = {mathdoc},
     volume = {4},
     year = {2012},
     doi = {10.5427/jsing.2012.4i},
     url = {http://geodesic.mathdoc.fr/articles/10.5427/jsing.2012.4i/}
}