TY  - JOUR
AU  - I. V. Protasov
TI  - Points of joint continuity for the semigroup of ultrafilters on an Abelian group
JO  - Sbornik. Mathematics
PY  - 1996
SP  - 287
EP  - 296
VL  - 187
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/SM_1996_187_2_a6/
LA  - en
ID  - SM_1996_187_2_a6
ER  -