@article{GDZPPN002488639, title = {On the Integers n for which ...(n) = k (II).}, journal = {Monatshefte f\"ur Mathematik}, volume = {116}, year = {1993}, pages = {175-196}, zbl = {0793.11024}, url = {http://dml.mathdoc.fr/item/GDZPPN002488639} }
Delange, Hubert. On the Integers n for which ...(n) = k (II).. Monatshefte für Mathematik, Tome 116 (1993) pp. 175-196. http://gdmltest.u-ga.fr/item/GDZPPN002488639/