TY  - JOUR
AU  - Jonathan A. Hillman
TI  - Aspherical four-manifolds and the centres of two-knot groups.
JO  - Commentarii mathematici Helvetici
PY  - 1981
SP  - 465
EP  - 473
VL  - 56
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1981__56_139880/
ID  - CMH_1981__56_139880
ER  -