Spectra of relic gravitons and the early history of the Hubble parameter.

@article{Grishchuk1991SpectraOR,
  title={Spectra of relic gravitons and the early history of the Hubble parameter.},
  author={Grishchuk and Solokhin},
  journal={Physical review. D, Particles and fields},
  year={1991},
  volume={43 8},
  pages={2566-2571}
}