TY  - JOUR
AU  - Pöschel, Reinhard
AU  - Wessel, Walter
TI  - Classes of graphs definable by graph algebra identities or quasi-identities
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1987
SP  - 581
EP  - 592
VL  - 28
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1987__28_3_a18/
LA  - en
ID  - CMUC_1987__28_3_a18
ER  -