MathSciNet bibliographic data MR540902 (81b:22017) 22E50 (10D40 12A67 22E55) Labesse, J.-P.; Langlands, R. P. $L$$L$-indistinguishability for ${\rm SL}(2)$${\rm SL}(2)$. Canad. J. Math. 31 (1979), no. 4, 726–785. Article

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