MathSciNet bibliographic data MR2607857 (2011c:11004) 11A15 (11R21) Balasubramanian, R.; Luca, F.; Thangadurai, R. On the exact degree of $\Bbb Q(\sqrt{a\sb 1,}\sqrt{a\sb 2},\dots,\sqrt{a\sb \ell})$$\Bbb Q(\sqrt{a\sb 1,}\sqrt{a\sb 2},\dots,\sqrt{a\sb \ell})$ over $\Bbb Q$$\Bbb Q$. Proc. Amer. Math. Soc. 138 (2010), no. 7, 2283–2288. Article

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