%0 Journal Article %A Ch. van Tienhoven %A D. Pellegrinetti %T Quadrigon Geometry: Circumscribed Squares and Van Aubel Points %J Journal for geometry and graphics %D 2021 %P 53-59 %V 25 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/JGG_2021_25_1_JGG_2021_25_1_a4/ %F JGG_2021_25_1_JGG_2021_25_1_a4