[1] A. Einstein, “On the Influence of Gravitation on the Propagation of Light,” Annalen der Physik, Vol. 340, No. 10, 1911, pp. 898-908. http://dx.doi.org/10.1002/andp.19113401005
[2] I. Newton, “The Principia: Mathematical Principles of Natural Philosophy,” University of California Press, Berkeley, 1999.
[3] H. A. Lorentz, “Electromagnetic Phenomena in a System Moving with Any Velocity Smaller than That of Light,” Proceedings of the Royal Netherlands Academy of Arts and Sciences, Vol. 6, 1904, pp. 809-831.