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Line 158:
| journal = [[Bulletin of the American Mathematical Society]]
| pages = 241–243
| title = On Euler's ''φ''-function
| volume = 13
| year = 1907
Line 168:
| journal = [[Bulletin of the American Mathematical Society]]
| pages = 109–110
| title = Note on Euler's ''φ''-function
| volume = 28
| year = 1922
Line 178:
| journal = [[Annals of Mathematics]]
| pages = 283–311
| title = The number of solutions of ''φ''(''x'') = ''m''
| volume = 150
| year = 1999
|