%0 Journal Article
%A P. Daugulis 
%T Classification and Normal Forms of Planar 4-Multisets and Quadrangles
%J Journal for geometry and graphics
%D 2018
%P 31-39
%V 22
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2018_22_1_JGG_2018_22_1_a3/
%F JGG_2018_22_1_JGG_2018_22_1_a3