@article{AMLG_1971__14_251480,
     author = {M.H. L\"ob and S.S. Wainer},
     title = {Hierarchies of number - theoretic functions {I,} {II:} a correction.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {198--200},
     publisher = {mathdoc},
     volume = {14},
     year = {1971},
     zbl = {0235.02038},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1971__14_251480/}
}