@article{JGG_2017_21_1_JGG_2017_21_1_a8,
     author = {N. J. Wildberger },
     title = {Rotor {Coordinates} and {Vector} {Trigonometry}},
     journal = {Journal for geometry and graphics},
     pages = {89--106},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2017},
     url = {http://geodesic.mathdoc.fr/item/JGG_2017_21_1_JGG_2017_21_1_a8/}
}