@article{AMLG_1983__23_138018,
     author = {Hans Kleine B\"uning},
     title = {A classification of an iterative hierarchy.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {175--186},
     publisher = {mathdoc},
     volume = {23},
     year = {1983},
     zbl = {0544.03016},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1983__23_138018/}
}