Ray Optics, Fermat's Principle, and Applications to General Relativity
Einstein's theory of relativity
Introduction to General Relativity
General Relativity. The Theoretical Minimum
Relativistic Electron Theory
The Eleventh Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories
Encyclopedia of Physics. Volume IV. Principles of Electrodynamics and Relativity
