%0 Journal Article
%A N. J. Wildberger 
%T Rotor Coordinates, Vector Trigonometry and Quadrilaterals, with Applications to the Four Bar Linkage
%J Journal for geometry and graphics
%D 2018
%P 257-268
%V 22
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2018_22_2_JGG_2018_22_2_a9/
%F JGG_2018_22_2_JGG_2018_22_2_a9