@article{10_4064_fm_118_1_11_31,
     author = {Zofia Adamowicz},
     title = {Perfect set theorems for $\ensuremath{\Pi}^1_2$ in the universe without choice},
     journal = {Fundamenta Mathematicae},
     pages = {11--31},
     publisher = {mathdoc},
     volume = {118},
     number = {1},
     year = {1983},
     doi = {10.4064/fm-118-1-11-31},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-118-1-11-31/}
}