1. B.C. Berndt, Generalized Eisenstein series and modified Dedekind sums. J. Reine Angew. Math. 272, 182–193 (1974)
2. F. Beukers, in Irrationality of
$$\pi ^2$$
π
2
, periods of an elliptic curve and
$$\Gamma _1(5)$$
Γ
1
(
5
)
, Diophantine approximations and transcendental numbers (Luminy 1982), Progr. Math. vol. 31 (Birkhäuser, Boston, 1983), pp. 47–66
3. D. Braak, On the integrability of the Rabi model. Phys. Rev. Lett. 107, 100401–100404 (2011)
4. J. Casanova, G. Romero, I. Lizuain, J.J. Garca-Ripoll, E. Solano, Deep strong coupling regime of the Jaynes-Cummings model. Phys. Rev. Lett. 105, 263603 (2010)
5. R.C. Gunning, The Eichler cohomology groups and automorphic forms. Trans. Am. Math. Soc. 100, 44–62 (1961)