TY  - JOUR
AU  - Nikos Frantzikinakis
TI  - Additive functions
 modulo a countable subgroup of ${\Bbb R}$
JO  - Colloquium Mathematicum
PY  - 2003
SP  - 117
EP  - 122
VL  - 95
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm95-1-9/
DO  - 10.4064/cm95-1-9
LA  - en
ID  - 10_4064_cm95_1_9
ER  -