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@article{10_4064_cm_13_1_95_99, author = {A. M\k{a}kowski and A. Schinzel}, title = {On the functions \ensuremath{\varphi}(n) and \ensuremath{\sigma}(n)}, journal = {Colloquium Mathematicum}, pages = {95--99}, publisher = {mathdoc}, volume = {13}, number = {1}, year = {1964}, doi = {10.4064/cm-13-1-95-99}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-13-1-95-99/} }
A. Mąkowski; A. Schinzel. On the functions φ(n) and σ(n). Colloquium Mathematicum, Tome 13 (1964) no. 1, pp. 95-99. doi : 10.4064/cm-13-1-95-99. http://geodesic.mathdoc.fr/articles/10.4064/cm-13-1-95-99/
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