@article{GDZPPN002045486,
title = {A proof theoretical fine structure in systems of ramified analysis.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {22},
year = {1982},
pages = {167-186},
zbl = {0506.03016},
url = {http://dml.mathdoc.fr/item/GDZPPN002045486}
}
Schmerl, Ulf R. A proof theoretical fine structure in systems of ramified analysis.. Archiv für mathematische Logik und Grundlagenforschung, Tome 22 (1982) pp. 167-186. http://gdmltest.u-ga.fr/item/GDZPPN002045486/