TY  - JOUR
AU  - Gordana Pavlović-Lažetić
TI  - Inference in a Relation Knowledge-base With two Types of Null Values
JO  - Publications de l'Institut Mathématique
PY  - 1993
SP  - 156 
VL  - _N_S_54
IS  - 68
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PIM_1993_N_S_54_68_a18/
LA  - en
ID  - PIM_1993_N_S_54_68_a18
ER  -