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Relativistic Sites:
Selected Papers on Geometric Algebra in Quantum Mechanics
These papers analyze the quantum mechanical Dirac theory of the electron with respect to its geometric structure as revealed by reformulation in terms of Spacetime Algebra http://modelingnts.la.asu.edu/html/GAinQM.html
The Klein-Gordon Field
A brief overview of the lagrangian for a Klein-Gordon field, by Professor John Norbury. http://fisicanet.terra.com.br/unificacao/quantum-field-theory-by-john-norbury.pdf
The Quantum Theory of Particles
A new approach to relativity, quantum mechanics, and field theory which solves many old puzzles, such as ultraviolet infinities and superluminal spreading of wave packets. http://www.geocities.com/meopemuk
Relativistic quantum mechanics
An electronic textbook for relativistic quantum mechanics is presented. It can be ordered free http://rel.qm.walterpfeifer.ch