1. Y. Berkovich, Groups of Prime Power Order, Vol. 1, De Gruyter Expositions in Mathematics, 46, Walter de Gruyter GmbH & Co. KG, Berlin, 2008.
2. R. Cheng, A. Dasgupta, B.R. Ebanks, L.F. Kinch, L.M. Larson and R.B. McFadden, When does f^{-1}=1/f ?, Amer. Math. Monthly 105 (1998), no. 8, 704–717.
3. R. Euler and J. Foran, On functions whose inverse is their reciprocal, Math. Mag. 54 (1981), no. 4, 185–189.
4. M. Griffiths, f(f(x))=x, windmills, and beyond, Math. Mag. 83 (2010), no. 1, 15–23.
5. M. Herzog, Counting group elements of order p modulo p^2, Proc. Amer. Math. Soc. 66 (1977), no. 2, 247–250.
6. H. Kurzweil and B. Stellmacher, The Theory of Finite Groups. An Introduction, Springer-Verlag, New York, 2004.
7. D.J. Schmitz, Inverse ambiguous functions on fields, Aequationes Math. 91 (2017), no. 2, 373–389.
8. D. Schmitz and K. Gallagher, Inverse ambiguous functions on some finite non-abelian groups, Aequationes Math. 92 (2018), no. 5, 963–973.
9. R. Schnabel, Elemente der Gruppentheorie, Mathematik für die Lehrerausbildung, B.G. Teubner, Stuttgart, 1984.
Google Scholar