TY  - JOUR
AU  - Grätzer, George
TI  - Notes on planar semimodular lattices IX \( \mathcal{C}_1 \)-diagrams
JO  - Discussiones Mathematicae. General Algebra and Applications
PY  - 2023
SP  - 25
EP  - 29
VL  - 43
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DMGAA_2023_43_1_a1/
LA  - en
ID  - DMGAA_2023_43_1_a1
ER  -