@article{GDZPPN002045907,
title = {Optimal bounds for ordinal comparison maps.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {25},
year = {1985},
pages = {99-108},
zbl = {0602.03011},
url = {http://dml.mathdoc.fr/item/GDZPPN002045907}
}
Clote, Peter. Optimal bounds for ordinal comparison maps.. Archiv für mathematische Logik und Grundlagenforschung, Tome 25 (1985) pp. 99-108. http://gdmltest.u-ga.fr/item/GDZPPN002045907/