@article{AMLG_1975__17_137908,
     author = {Shlomo Vinner},
     title = {On two complete sets in the analytical and the arithmetical hierarchies.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {81--84},
     publisher = {mathdoc},
     volume = {17},
     year = {1975},
     zbl = {0317.02048},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1975__17_137908/}
}