Relations among Dirichlet series whose coefficients are class numbers of   binary cubic forms II
  As a continuation of the authors and Wakatsuki's previous paper [5], we study relations among Dirichlet series whose coefficients are class numbers of binary cubic forms. We show that for any integral models of the space of binary cubic forms, the associated Dirichlet series satisfies a simple explicit relation to that of the dual other than the usual functional equation. As an application, we write the functional equations of these Dirichlet series in self dual forms. 
Yasuo Ohno, Takashi Taniguchi
math.NT