참고문헌
- A. Einstein, The meaning of relativity, Princeton University Press, Princeton, New Jersey, 1950
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J. W. Lee, Field equations of SE(k)-manifold
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J. W. Lee, An Einstein's connection with zero torsion vector in even-dimensional UFT
$X_n$ , Jour. of the Chungcheong Math. Soc. 24 (2011), no. 4, 869-881 -
J. W. Lee, A solution of Einstein's field equations for the third class in
$X_4$ , Jour. of the Chungcheong Math. Soc. 26 (2013), no. 1, 167-174 https://doi.org/10.14403/jcms.2013.26.1.167 - J. W. Lee and K. T. Chung, A solution of Einstein's unified field equations, Comm. Korean Math. Soc. 11 (1996), no. 4, 1047-1053.
- V. Hlavaty, Geometry of Einstein's unified field theory, P. Noordhoff Ltd. New York, 1957.