TY  - JOUR
AU  - Schommer-Pries, Christopher J
TI  - Central extensions of smooth 2–groups and a finite-dimensional string 2–group
JO  - Geometry & topology
PY  - 2011
SP  - 609
EP  - 676
VL  - 15
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.2140/gt.2011.15.609/
DO  - 10.2140/gt.2011.15.609
ID  - GT_2011_15_2_a0
ER  -