%0 Journal Article
%A Lubotzky, Alexander
%T Lattices of minimal covolume in 𝑆𝐿₂: a non-Archimedean analogue of Siegel’s theorem 𝜇≥𝜋/21
%J Journal of the American Mathematical Society
%D 1990
%P 961-975
%V 03
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1990-1070003-7/
%R 10.1090/S0894-0347-1990-1070003-7
%F 10_1090_S0894_0347_1990_1070003_7