@article{10_4064_fm_46_2_123_135,
     author = {J. W. Addison},
     title = {Separation principles in the hierarchies of classical and effective descriptive set theory},
     journal = {Fundamenta Mathematicae},
     pages = {123--135},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1958},
     doi = {10.4064/fm-46-2-123-135},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-46-2-123-135/}
}