TY  - JOUR
AU  - Knast, Robert
TI  - Some theorems on graph congruences
JO  - RAIRO. Informatique théorique
PY  - 1983
SP  - 331
EP  - 342
VL  - 17
IS  - 4
PB  - EDP-Sciences
UR  - http://www.numdam.org/item/ITA_1983__17_4_331_0/
LA  - en
ID  - ITA_1983__17_4_331_0
ER  -