Theory and empirical capturing of the third sector at the macro level: deliverable 2.1 of the project: “Impact of the Third sector as Social Innovation” (ITSSOIN), European Commission - 7th Framework Programme - Anheier, Helmut K.; Krlev, Gorgi; Preuß, Stina; Mildenberger, Georg; Einarsson, Torbjörn (European Commission, 2014)