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J.  Kim, Sirbu, A., Giannotti, F., and Gabrielli, L., ?Digital Footprints of International Migration on Twitter?, in International Symposium on Intelligent Data Analysis, 2020.\par \par A.  Sirbu, Andrienko, G., Andrienko, N., Boldrini, C., Conti, M., Giannotti, F., Guidotti, R., Bertoli, S., Kim, J., Muntean, C. Ioana, and others, ?Human migration: the big data perspective?, International Journal of Data Science and Analytics, pp. 1?20, 2020.\par \par }