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In this paper, the cosmological "constant" and the Hubble parameter are considered in the Weyl theory of gravity, by taking them as functions of $r$ and $t$, respectively.
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S.H. Suyu and et.,al., Dissecting the Gravitational Lens B1608+656. II. Precision Measurements of the Hubble Constant, Spatial Curvature, and the Dark Energy Equation of State , Astrophysical Journal 711: 201 (2010)
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2011
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Adam G. Riess and et., al., A 3 % \% Solution: Determination of the Hubble Constant With the Hubble Space Telescope and Wide Field Camera , The Astrophysical Journal 730: 119 (2011)
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2007
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Cited in the paper.
R. Schimming and Hans-J Urgen Schmidt, On the history of fourth order metric theories of gravitation , arXiv:gr-qc/0412038v1
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S. Carloni, P. K. S. Dunsby and A. Troisi, Cosmological dynamics of fourth order gravity , arXiv: gr-qc0906-1991v1
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2011
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