The gravitational wave spectrum from coalescing massive black hole binaries formed by merging processes of their host galaxies has been studied by Jaffe & Backer (2003).

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Values of the power law index $\alpha$ are found to be 1.2, 1.7 and 2.11 for Mkn 501, Mkn 421 and Mkn 766, respectively. For more details see Rieger & Mannheim (2000), Guainazzi et al. (1999) and Boller et al. (2001).

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...Lincoln & Will (1990)

One can see also Zakharov (1996,1997,1998) where this approximation was used to analyze the evolution of a binary neutron star system in which the lower mass object is losing matter since it fills its Roche lobe.

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...Ni (2002)

See also Fig. 13 from the paper by Rüdiger (2002).

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