1. Laplace’s integral, the gamma function, and beyond;de Azevedo Pribitkin;Amer. Math. Monthly,2002
2. Hecke’s Theory of Modular Forms and Dirichlet Series;Berndt,2008
3. Connection between functional equations and modular relations, and functions of exponential type;Bochner;J. Indian Math. Soc.,1952
4. Hecke’s functional equation and arithmetical identities;Chandrasekharan;Ann. Math. Second Ser.,1961
5. Log-polynomial period function for Hecke groups;Hassen;Ramanujan J.,1999