MathSciNet bibliographic data MR552460 (81h:10042a) 10D40 (22E50) Li, Wen Ch'ing Winnie On the representations of ${\rm GL}(2)$${\rm GL}(2)$. I. $\varepsilon$$\varepsilon$-factors and $n$$n$-closeness. J. Reine Angew. Math. 313 (1980), 27–42. Article

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