1 2 Bollen, Kenneth A. and Paxton, Pamela, "Subjective Measures of Liberal Democracy", Comparative Political Studies, vol.33, no.1 (February 2000), pp.58-86 ↑ Giannone, Diego, "Political and ideological aspects in the measurement of democracy: the Freedom House case", Democratization, vol.17, no.1 (February 2010), pp.68-97. ↑ "Concept Misformation in Comparative Politics."