Zeta-Functions of Binary Hermitian Forms and Special Values of Eisenstein Series on Three-Dimensional Hyperbolic Space. Jürgen Elstrodt, Fritz Grunewald, Jens Mennicke (1987) Mathematische Annalen
Zur Transformationstheorie von Thetareihen indefiniter quadratischer Formen. H. Klingen (1960) Mathematische Annalen