@article{AMLG_1981__21_137980,
     author = {W. Pohlers},
     title = {Cut-elimination for impredicative infinitary systems. {Part} {I.} {Ordinal-analysis} for {ID1.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {113--130},
     publisher = {mathdoc},
     volume = {21},
     year = {1981},
     zbl = {0484.03030},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1981__21_137980/}
}