Why are there six degrees of separation in a social network?
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S. Boccaletti | B. Barzel | M. Perc | D. Papo | R. Criado | A. Raigorodskii | M. Romance | K. Alfaro-Bittner | D. Musatov | E. Vasilyeva | D. Aleja | K. Kovalenko | I. Samoylenko | Eva Primo