Weakly commensurable arithmetic groups and isospectral locally symmetric spaces
Publications Mathématiques de l'IHÉS, Tome 109 (2009), pp. 113-184. 
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     title = {Weakly commensurable arithmetic groups and isospectral locally symmetric spaces},
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     language = {en},
     url = {http://archive.numdam.org/articles/10.1007/s10240-009-0019-6/}
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Prasad, Gopal; Rapinchuk, Andreis. Weakly commensurable arithmetic groups and isospectral locally symmetric spaces. Publications Mathématiques de l'IHÉS, Tome 109 (2009), pp. 113-184. doi : 10.1007/s10240-009-0019-6. http://archive.numdam.org/articles/10.1007/s10240-009-0019-6/

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