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References
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© 1982 Springer-Verlag
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Mohan, A.L., Suryanarayana, D. (1982). Perfect totient numbers. In: Alladi, K. (eds) Number Theory. Lecture Notes in Mathematics, vol 938. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0097177
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DOI: https://doi.org/10.1007/BFb0097177
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