TY  - JOUR
AU  - Bjarni Jonsson
TI  - Algebraic Extensions of Relational Systems.
JO  - Mathematica Scandinavica
PY  - 1962
SP  - 179
EP  - 205
VL  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1962__11_165827/
ID  - MS2_1962__11_165827
ER  -