%0 Journal Article
%A Mikhail Ershov
%A Wolfgang Lück
%T The first $L^2$-Betti number and approximation in arbitrary characteristic
%J Documenta mathematica
%D 2014
%P 313-331
%V 19
%U http://geodesic.mathdoc.fr/articles/10.4171/dm/448/
%R 10.4171/dm/448
%F 10_4171_dm_448