@article{CM_1985__54_1_3_0,
     author = {Blass, Piotr},
     title = {Picard groups of {Zariski} surfaces},
     journal = {Compositio Mathematica},
     pages = {3--36},
     publisher = {Martinus Nijhoff Publishers},
     volume = {54},
     number = {1},
     year = {1985},
     mrnumber = {782383},
     zbl = {0624.14021},
     language = {en},
     url = {http://www.numdam.org/item/CM_1985__54_1_3_0/}
}