TY  - JOUR
AU  - Artikis, Theodore
TI  - An operator for characteristic functions
JO  - Portugaliae mathematica
PY  - 1983
SP  - 409
EP  - 416
VL  - 42
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1983__42_4_115556/
LA  - en
ID  - PORMA_1983__42_4_115556
ER  -