@article{AMLG_1977__18_137926,
     author = {Diana Schmidt},
     title = {Built-up systems of fundamental sequences and hierarchies of number-theoretic functions.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {47--54},
     publisher = {mathdoc},
     volume = {18},
     year = {1977},
     zbl = {0358.02061},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1977__18_137926/}
}