@article{Haber05:PBS,
                  author = "J.~Haber and M.~Magnor and H.-P.~Seidel",
                  title = "Physically-based Simulation of Twilight Phenomena",
                  journal = "ACM Trans. on Computer Graphics",
                  year = "2005",
		volume = 24,
		number = 4,
                  month = oct,
		pages="1353--1373"
}