@article{CM_1985__54_1_37_0,
     author = {Blass, Piotr and Lang, Jeffrey},
     title = {Appendix : {{\textquotedblleft}Picard} groups of {Zariski} surfaces{\textquotedblright}},
     journal = {Compositio Mathematica},
     pages = {37--40},
     publisher = {Martinus Nijhoff Publishers},
     volume = {54},
     number = {1},
     year = {1985},
     mrnumber = {1557073},
     zbl = {0624.14022},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1985__54_1_37_0/}
}