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A. Beesham 《Astrophysics and Space Science》1988,150(2):393-394
Recently in an interesting article Reddy and Venkateswarlu (1987) have shown that a Birkhoff-type theorem holds in the scale-covariant theory of gravitation when the gauge-function which occurs in the theory is independent of time. We show that their result can be deduced simply and easily without actually having to solve the field equations. 相似文献
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