TY  - JOUR
AU  - P. Daugulis 
TI  - Classification and Normal Forms of Planar 4-Multisets and Quadrangles
JO  - Journal for geometry and graphics
PY  - 2018
SP  - 31
EP  - 39
VL  - 22
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2018_22_1_JGG_2018_22_1_a3/
ID  - JGG_2018_22_1_JGG_2018_22_1_a3
ER  -