Economist Data team. The Economist website, (апреля 2015)As of Q1 2015, Sources: Thomson Reuters; awk scripts+R converted the data embedded in Javascript.
J. Mazzarella, и T. Team. Astroinformatics, том 12 из Proceedings of the International Astronomical Union, стр. 379-384. Cambridge University Press, (2016)
S. Heap, A. Szalay, и W. Team. Astroinformatics, том 12 из Proceedings of the International Astronomical Union, стр. 373-378. Cambridge University Press, (2016)