@article{Koch10:1Ca,
author = {Michael Koch and Joachim Denzler and Christoph Redies},
journal = {PLoS ONE},
title = {$1/f^2$ Characteristics and Isotropy in the Fourier Power Spectra of Visual Art, Cartoons, Comics, Mangas, and Different Categories of Photographs},
pages = {e12268},
year = {2010},
}