Marini L., Bertolli A., Bona E., Federici G., Martini F., Prosser F., Bommarco R. (2012) Beta-diversity patterns elucidate mechanisms of alien plant invasion in mountainsGlobal Ecology and Biogeography vol.21 (11): http://onlinelibrary.wiley.com/doi/10.1111/geb.12006/abstract