A new expression for the product of the two Dirichlet series is given. From this new expression we derive many results. Among other things we give here another proof of Wilton's expression for the product of two Riemann's zeta functions through our new expression. Other results including mean value theorems will be treated elsewhere.
Masumi Nakajima. "A new expression for the product of the two Dirichlet series I." Proc. Japan Acad. Ser. A Math. Sci. 79 (2) 19 - 22, Feb. 2003. https://doi.org/10.3792/pjaa.79.19