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@article{10_4064_aa_22_2_201_206, author = {P. Erd\"os and R. Hall}, title = {On the values of {Euler's} \ensuremath{\varphi}-function}, journal = {Acta Arithmetica}, pages = {201--206}, publisher = {mathdoc}, volume = {22}, number = {2}, year = {1972}, doi = {10.4064/aa-22-2-201-206}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-22-2-201-206/} }
P. Erdös; R. Hall. On the values of Euler's φ-function. Acta Arithmetica, Tome 22 (1972) no. 2, pp. 201-206. doi : 10.4064/aa-22-2-201-206. http://geodesic.mathdoc.fr/articles/10.4064/aa-22-2-201-206/
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