1. Vega: A visualization grammar, November 2016. https://vega.github.io/vega/
2. Ball, T., Eick, S.G.: Softw. Vis. Large. East 29(4), 33–43 (1996)
3. Studies in Classification, Data Analysis, and Knowledge Organization;MR Berthold,2008
4. Bostock, M., Ogievetsky, V., Heer, J.: D3 data-driven documents. IEEE Trans. Visual Comput. Graphics 17(12), 2301–2309 (2011). http://dx.doi.org/10.1109/TVCG.2011.185
5. Bruneliere, H., Cabot, J., Jouault, F., Madiot, F.: Modisco: a generic and extensible framework for model driven reverse engineering. In: Proceedings of the IEEE/ACM International Conference on Automated Software Engineering, pp. 173–174. ASE 2010, NY (2010). http://doi.acm.org/10.1145/1858996.1859032