1. Kaluza, T. (1921). Zum Unitätsproblem der Physik,Sitzgungsberichte der Preussichen Akademic der Wissenschaften,1921, 966.
2. Klein, O. (1926).Zeitschrift der Physik,37, 895; Klein, O. (1939). On the theory of charged fields, inNew theories in Physics (Conference Organized in Collaboration with International Union of Physics and the Polish Co-operation Committee, Warsaw, May 30?June 3, 1938), Paris, p. 77.
3. Einstein, A. (1951).The Meaning of Relativity, AppendixII, 5th ed., rev., Methuen, London, p. 127; Jakubowicz, A., and Klekowska, J. (1969). The necessary and sufficient condition for the existence of the unique connection of the two-dimensional generalized Riemannian space,Tensor N, S.,20, 72; Chung, K. T., and Lee, Y. J. (1988).International Journal of Theoretical Physics,27, 1083; Chung, K. T., and Hwang, H. J. (1988).International Journal of Theoretical Physics,27, 1105; Shavokhina, N. S. (1986). Nonsymmetric metric in nonlinear field theory, Preprint of the JINR, P2-86-685, Dubna.
4. Kaufman, B. (1956). Mathematical structure of the nonsymmetric field theory,Helvetica Physica Acta Supplement,1956, 227; Chung, K. T. (1983). Some recurrence relations for Einstein's connection for 2-dimensional unified theory of relativity,Acta Mathematica Hungarica,41(1?2), 47.
5. Einstein, A., and Kaufman, B. (1954).Annals of Mathematics,59, 230; Kaufman, B. (1945).Annals of Mathematics,46, 578.