@article{AMLG_1984__24_138023,
     author = {C.T. Chong},
     title = {Minimal ...-hyperdegrees.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {63--72},
     publisher = {mathdoc},
     volume = {24},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1984__24_138023/}
}