When using TagSpheres please cite:
Jänicke S., Scheuermann G. (2017). On the Visualization of Hierarchical Relations and Tree Structures with TagSpheres. In: Braz J. et al. (eds) Computer Vision, Imaging and Computer Graphics Theory and Applications. VISIGRAPP 2016. Communications in Computer and Information Science, vol 693. Springer, Cham. PDF-preprint

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