@article{FUNDAM_1947__34_1_213147,
     author = {Andrzej Alexiewicz},
     title = {On {Hausdorff} classes},
     journal = {Fundamenta Mathematicae},
     pages = {61},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1947},
     zbl = {0038.03303},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/FUNDAM_1947__34_1_213147/}
}