http://journals.plos.org/ploscompbiol/article/file?id=10.1371/journal.pcbi.1002889&type=printable (Publisher version)
Sinz, F., & Bethge, M. (2013). Temporal Adaptation Enhances Efficient Contrast Gain Control on Natural Images. PLoS Computational Biology, 9(1), 1-13. doi:10.1371/journal.pcbi.1002889.