MathSciNet bibliographic data MR1070003 22E40 (20G25 22E20) Lubotzky, Alexander Lattices of minimal covolume in ${\rm SL}_2$${\rm SL}_2$: a non-Archimedean analogue of Siegel's theorem $\mu\geq\pi/21$$\mu\geq\pi/21$. J. Amer. Math. Soc. 3 (1990), no. 4, 961–975. Article

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