Nagell's Totient Function.
Cohen, Eckford
Mathematica Scandinavica, Tome 8 (1960), p. 55-58 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1960-01-01
EUDML-ID : urn:eudml:doc:165732 
@article{GDZPPN002346109,
     title = {Nagell's Totient Function.},
     journal = {Mathematica Scandinavica},
     volume = {8},
     year = {1960},
     pages = {55-58},
     zbl = {0100.03804},
     url = {http://dml.mathdoc.fr/item/GDZPPN002346109}
}

Cohen, Eckford. Nagell's Totient Function.. Mathematica Scandinavica, Tome 8 (1960) pp. 55-58. http://gdmltest.u-ga.fr/item/GDZPPN002346109/