Quaternions
Motivation/Overview:
Technical papers:
Die funktionentheoretischen Beziehungen der Maxwellschen Aethergleichungen - C. Lanczos
Euler's formula and De Moivre's formula for quaternions - E. Cho
Biquaternions
Special Relativity
General Relativity
Maxwell Equations
Dirac Equation
Quantum Field Theory
Quaternionic Quantum Field Theory - S. L. Adler (Download is for free)
Related topics: Octonions, Sedenions, Hypercomplex Numbers, Geometric Algebra