TY  - JOUR
AU  - N. J. Wildberger 
TI  - Rotor Coordinates, Vector Trigonometry and Quadrilaterals, with Applications to the Four Bar Linkage
JO  - Journal for geometry and graphics
PY  - 2018
SP  - 257
EP  - 268
VL  - 22
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2018_22_2_JGG_2018_22_2_a9/
ID  - JGG_2018_22_2_JGG_2018_22_2_a9
ER  -