In this paper we give an integral representation for a Whittaker function of an non holomorphic Eisenstein series which is a non holomorphic Sigel modular form of degree 2. Our integral representation is very useful to the theory of the theta lifting of automorphic forms.
"On Kaufhold’s Whittaker functions." Proc. Japan Acad. Ser. A Math. Sci. 88 (7) 103 - 108, July 2012. https://doi.org/10.3792/pjaa.88.103