@article{koch2010f,
	pages = {e12268},
	year = {2010},
	journal = {PLoS ONE},
	author = {Michael Koch and Joachim Denzler and Christoph Redies},
	title = {$1/f^2$ Characteristics and Isotropy in the Fourier Power Spectra of Visual Art, Cartoons, Comics, Mangas, and Different Categories of Photographs},
}