1. J. Desmond , Solution to Problem B-182, The Fibonacci Quarterly, 8.5 (1970), 549–551.
2. Fixed point indices of iterated maps;Dold A.;Invent. Math.,1983
3. G. Everest and T.Ward, An Introduction to Number Theory, Springer Graduate Texts in Mathematics, Springer-Verlag, London, 2005.
4. Time-changes preserving zeta functions;Jaidee S.;Proc. Amer. Math. Soc,2019
5. Reciprocity Laws, From Euler to Eisenstein;Lemmermeyer F.;Springer Monographs in Mathematics,2000