%0 Journal Article %A Prasad, Dipendra %T Trilinear forms for representations of $\mathrm {GL}(2)$ and local $\epsilon $-factors %J Compositio Mathematica %D 1990 %P 1-46 %V 75 %N 1 %I Kluwer Academic Publishers %U http://www.numdam.org/item/CM_1990__75_1_1_0/ %G en %F CM_1990__75_1_1_0