@article{SM_1981_38_3_a1,
     author = {S. A. Evdokimov},
     title = {Analytic properties of {Euler} products for congruence-subgroups of $\operatorname{Sp}_2(\mathbf Z)$},
     journal = {Sbornik. Mathematics},
     pages = {335--363},
     year = {1981},
     volume = {38},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_38_3_a1/}
}