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Ramón González Calvet. Treatise of plane geometry through geometric algebra. Treatise of Plane Geometry, 2007. http://www.xtec.cat/~rgonzal1/treatise2.htm
Sobczyk Conformal Mappings in Geometric Algebra
Catoni, Francesco, Roberto Cannata, Vincenzo Catoni, and Paolo Zampetti. 2004. “Two-Dimensional Hypercomplex Numbers and Related Trigonometries and Geometries.” Advances in Applied Clifford Algebras 14 (1) (March 1): 47–68. doi:10.1007/s00006-004-0008-2.
The Mathematics of Minkowski Space-Time - With an Introduction to Commutative Hypercomplex Numbers. 2014. Accessed January 18. http://www.springer.com/birkhauser/mathematics/book/978-3-7643-8613-9.

Sobczyk, Garret. "The hyperbolic number plane." The College Mathematics Journal 26.4 (1995): 268-280. http://garretstar.com/secciones/publications/docs/HYP2.PDF