@article{10_4064_aa142_2_4,
     author = {Nic Niedermowwe},
     title = {The density of $S$-integral points in projective space
 with respect to a quadric},
     journal = {Acta Arithmetica},
     pages = {145--156},
     publisher = {mathdoc},
     volume = {142},
     number = {2},
     year = {2010},
     doi = {10.4064/aa142-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa142-2-4/}
}