A Bound on Mixing Efficiency for the Advection--Diffusion Equation. Thiffeault, J., Doering, C. R., & Gibbon, J. D. Journal of Fluid Mechanics, 521:105-114, December, 2004.
bibtex   
@Article{Thiffeault2004,
  author = 	 {Jean-Luc Thiffeault and C. R. Doering and J. D. Gibbon},
  title = 	 {A Bound on Mixing Efficiency for the
                  Advection--Diffusion Equation},
  journal = 	 jfm,
  year = 	 2004,
  volume =	 {521},
  pages =	 {105-114},
  month =	 dec,
  OLDeprint =	 {arXiv:physics/0307140}
}

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