Dihua Jiang 
Degree 16 Standard L-function of $GSp(2) /times GSp(2)$ [PDF ebook] 

Automorphic L-functions, introduced by Robert Langlands in the 1960s, are natural extensions of such classical L-functions as the Riemann zeta function, Hecke L-functions, etc. They form an important part of the Langlands Program, which seeks to establish