Picard groups of Zariski surfaces
Compositio Mathematica, Tome 54 (1985) no. 1, pp. 3-36. 
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     author = {Blass, Piotr},
     title = {Picard groups of {Zariski} surfaces},
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     pages = {3--36},
     publisher = {Martinus Nijhoff Publishers},
     volume = {54},
     number = {1},
     year = {1985},
     mrnumber = {782383},
     zbl = {0624.14021},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1985__54_1_3_0/}
}
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Blass, Piotr. Picard groups of Zariski surfaces. Compositio Mathematica, Tome 54 (1985) no. 1, pp. 3-36. http://archive.numdam.org/item/CM_1985__54_1_3_0/

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