@inbook {tagspheres2,
	title = {On the Visualization of Hierarchical Relations and Tree Structures with TagSpheres},
	booktitle = {Computer Vision, Imaging and Computer Graphics - Theory and Applications},
	series = {Communications in Computer and Information Science},
	year = {In Press},
	publisher = {Springer International Publishing},
	organization = {Springer International Publishing},
	author = {J{\"a}nicke, Stefan and Gerik Scheuermann}
}
