[1] P.G.Bass, The Special Theory of Relativity - A Classical Approach, Apeiron Vol.10. (4), October 2003

[2] V. Fock, The Theory of Space, Time and Gravitation, Pergamon Press, (1959)

[3] Piaggio, Differential Equations, G.Bell and Sons :td., (1960)

[4] Peter Gabriel Bergmann, Introduction to the Theory of Relativity, Dover publications Inc., (1976)

[5] Max Born, Einstein's Theory of Relativity, Dover Publication Inc., (1965)