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[en] In the paper it is shown that the tetrad formalism can be used to deduce the Lagrangian responsible for the effects of gravitation. The fields of a tetrad specified by a certain type of observers can be considered as physical fields and then these fields can be rendered to follow the variational principle. A Lagrangian can be built up along the classical routes, and the Euler-Lagrange equations turn out to be Einstein's equations. It is essential that local Lorentz covariance is used in this deduction. (author)
Source
Nov 1979; 6 p; ISBN 963 371 588 1; 
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