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Halbheer, Daniel; Schmutzler, Armin; Niggli, Sarah (2006). What does it take to sell environmental policy? An empirical analysis of referendum data. Environmental and Resource Economics, 33(4):441-462.
Halbheer, Daniel; Niggli, Sarah; Schmutzler, Armin (2005). What does it take to sell Environmental Policy? An empirical Analysis of Referendum Data. Working paper series / Socioeconomic Institute No. 304, University of Zurich.