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Lattices of minimal covolume in ${\rm SL}\sb 2$ : a non-Archimedean analogue of Siegel's theorem $\mu\geq\pi/21$

Author(s): Alexander Lubotzky
Journal: J. Amer. Math. Soc. 3 (1990), 961-975.
MSC: Primary 22E40; Secondary 20G25, 22E20
MathSciNet review: 1070003
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