1. Andrews, G.E.: Identities in combinatorics I: On sorting two ordered sets. Discrete Math. 11, 97–106 (1975)
2. Böcherer, S., Schulze-Pillot, R.: On the central critical value of the triple product L-function. In: Number Theory 1993–94, Cambridge: Cambridge University Press, 1996, pp. 1–46
3. Colin de Verdiere, Y.: Ergodicité et fonctions propres du laplacien. Commun. Math. Phys. 102, 497–502 (1985)
4. Eichler, M.: The basis problem for modular forms and the traces of the Hecke operators. In: Modular functions of one variable I, Lecture Notes Math. 320, Berlin-Heidelberg-New York: Springer-Verlag, 1973, pp. 76–151
5. Garrett, P.: Decomposition of Eisenstein series: Rankin Triple products. Ann. Math. 125, 209–235 (1987)