@article{GDZPPN002045370,
title = {Undecidability vs transfinite induction for the consistency of hyperarithmetical sets.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {22},
year = {1982},
pages = {19-26},
zbl = {0494.03038},
url = {http://dml.mathdoc.fr/item/GDZPPN002045370}
}
Caporaso, S.; Pani, G. Undecidability vs transfinite induction for the consistency of hyperarithmetical sets.. Archiv für mathematische Logik und Grundlagenforschung, Tome 22 (1982) pp. 19-26. http://gdmltest.u-ga.fr/item/GDZPPN002045370/