1. L. J. Boya, “The thermal radiation formula of Planck,” Rev. Acad. Ciencias, Zaragoza 58, 91 (2003).
2. A. Einstein, The Meaning of Relativity (5th ed., Princeton Univ. Press, Princeton, 1955).
3. M. I. Wanas, “Parameterized absolute parallelism: a geometry for physical applications,” Turk. J. Phys. 24, 473 (2000).
4. S. Weinberg, Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity (Joim Wiley and Sons, 1972).
5. M. I. Wanas, S. N. Osman, and R. I. El-Kholy, “Unification principle and a geometric field theory,” Open Physics 13 (1), 247 (2015).