no. 1
Trilinear forms for representations of GL (2) and local ϵ-factors
Compositio Mathematica, Tome 75 (1990) no. 1, pp. 1-46. 
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     title = {Trilinear forms for representations of $\mathrm {GL}(2)$ and local $\epsilon $-factors},
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     pages = {1--46},
     publisher = {Kluwer Academic Publishers},
     volume = {75},
     number = {1},
     year = {1990},
     zbl = {0731.22013},
     language = {en},
     url = {http://www.numdam.org/item/CM_1990__75_1_1_0/}
}
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Prasad, Dipendra. Trilinear forms for representations of $\mathrm {GL}(2)$ and local $\epsilon $-factors. Compositio Mathematica, Tome 75 (1990) no. 1, pp. 1-46. http://www.numdam.org/item/CM_1990__75_1_1_0/

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