Klein is deeply indebted to several members of the GA community and their work. Beyond the works cited here, the author stands of the shoulders of giants (Felix Klein, Sophus Lie, Arthur Cayley, William Rowan Hamilton, Julius Pl├╝cker, and William Kingdon Clifford, among others).

[1] Gunn, Charles G. (2019). Course notes Geometric Algebra for Computer Graphics, SIGGRAPH 2019. arXiv link

[2] Steven De Keninck and Charles Gunn. (2019). SIGGRAPH 2019 Geometric Algebra Course. youtube link

[3] Leo Dorst, Daniel Fontijne, Stephen Mann. (2007) Geometric Algebra for Computer Science. Burlington, MA: Morgan Kaufmann Publishers Inc.