Bastolla, UgoLässig, MichaelManrubia, Susanna C.Valleriani, Angelo2004-12-142004-12-1420012001http://hdl.handle.net/2003/1917610.17877/DE290R-6881enThe American Physical SocietyPhysical Review Letters530Shape of Ecological Networks10.1103/PhysRevLett.86.4418article (journal)