TY  - JOUR
AU  - Mikhail Ershov
AU  - Wolfgang Lück
TI  - The first $L^2$-Betti number and approximation in arbitrary characteristic
JO  - Documenta mathematica
PY  - 2014
SP  - 313
EP  - 331
VL  - 19
UR  - http://geodesic.mathdoc.fr/articles/10.4171/dm/448/
DO  - 10.4171/dm/448
ID  - 10_4171_dm_448
ER  -