Catini, RobertoKaramshuk, DmytroPenner, OrionRiccaboni, Massimo2015-09-162015-09-162015-09-16201510.1016/j.respol.2015.01.011https://infoscience.epfl.ch/handle/20.500.14299/117932Identifying geographic clusters: A network analytic approachtext::journal::journal article::research article