Pappalardo, Luca
Simini, Filippo
Rinzivillo, Salvatore
Pedreschi, Dino
Giannotti, Fosca
Barabási, Albert-László
Article History
Received: 15 December 2014
Accepted: 24 July 2015
First Online: 8 September 2015
Competing interests
: The authors declare no competing financial interests.