TY  - JOUR
AU  - Đ. Kurepa
TI  - On some coupled operators in ordered sets
JO  - Matematički vesnik
PY  - 1953
SP  - 15 
VL  - 5
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MV_1953_5_3-4_a1/
ID  - MV_1953_5_3-4_a1
ER  -