@article{MZ_1989__201_4_174046,
     author = {David A. Cox},
     title = {Picard {Numbers} of {Surfaces} in {3-Dimensional} {Weighted} {Projective} {Spaces.}},
     journal = {Mathematische Zeitschrift},
     pages = {183--190},
     publisher = {mathdoc},
     volume = {201},
     number = {4},
     year = {1989},
     zbl = {0686.14041},
     url = {http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174046/}
}