TY  - JOUR
AU  - Jonathan A. Hillman
TI  - Two-knot groups with torsion free abelian normal subgroups of rank two.
JO  - Commentarii mathematici Helvetici
PY  - 1988
SP  - 664
EP  - 671
VL  - 63
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1988__63_4_140138/
ID  - CMH_1988__63_4_140138
ER  -