@article{CM_1993__87_3_241_0,
     author = {Koras, Mariusz},
     title = {A characterization of $\mathbb {A}^2 / \mathbb {Z}_a$},
     journal = {Compositio Mathematica},
     pages = {241--267},
     publisher = {Kluwer Academic Publishers},
     volume = {87},
     number = {3},
     year = {1993},
     mrnumber = {1227447},
     zbl = {0807.14025},
     language = {en},
     url = {http://www.numdam.org/item/CM_1993__87_3_241_0/}
}