Caldarelli, G.Coccetti, F.De Los Rios, P.2010-03-222010-03-222010-03-22200410.1103/PhysRevE.70.027102https://infoscience.epfl.ch/handle/20.500.14299/48364WOS:000223784600089Preferential exchange: Strengthening connections in complex networkstext::journal::journal article::research article