Non-abelian extensions have nonsimple spectrum
Compositio Mathematica, Volume 65 (1988) no. 2, pp. 155-170.
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author = {Robinson, E. Arthur},
title = {Non-abelian extensions have nonsimple spectrum},
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Robinson, E. Arthur. Non-abelian extensions have nonsimple spectrum. Compositio Mathematica, Volume 65 (1988) no. 2, pp. 155-170. http://www.numdam.org/item/CM_1988__65_2_155_0/

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