TY  - JOUR
AU  - Christian Liedtke
TI  - Natural central extensions of groups
JO  - Groups, geometry, and dynamics
PY  - 2008
SP  - 245
EP  - 261
VL  - 2
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/38/
DO  - 10.4171/ggd/38
ID  - 10_4171_ggd_38
ER  -