TY  - JOUR
AU  - Greg Hjorth
TI  - The isomorphism relation on countable torsion free
 abelian groups
JO  - Fundamenta Mathematicae
PY  - 2002
SP  - 241
EP  - 257
VL  - 175
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm175-3-2/
DO  - 10.4064/fm175-3-2
LA  - en
ID  - 10_4064_fm175_3_2
ER  -