Geodesic multiplication and BRST-like operators
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;
Paal, Eugen
General relativity and gravitation
1996
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8, p. 991-998
On the pressure of gravitational waves
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General relativity and gravitation
2006
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1, p. 1-13
https://www.researchgate.net/publication/226526191_On_the_pressure_of_gravitational_waves