no. 2
Convolution L-series
Compositio Mathematica, Tome 91 (1994) no. 2, pp. 145-158. 
@article{CM_1994__91_2_145_0,
     author = {Duke, W. and Iwaniec, Henryk},
     title = {Convolution $L$-series},
     journal = {Compositio Mathematica},
     pages = {145--158},
     publisher = {Kluwer Academic Publishers},
     volume = {91},
     number = {2},
     year = {1994},
     zbl = {0820.11033},
     mrnumber = {1273646},
     language = {en},
     url = {www.numdam.org/item/CM_1994__91_2_145_0/}
}
Duke, W.; Iwaniec, H. Convolution $L$-series. Compositio Mathematica, Tome 91 (1994) no. 2, pp. 145-158. http://www.numdam.org/item/CM_1994__91_2_145_0/

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