Liefferink, D., Jörgens, H. & Lenschow, A. (2014). Introduction: Theoretical framework and research design. In Jörgens and  H. and  Lenschow and  A. and  Liefferink and  D. (Ed.), Understanding Environmental Policy Convergence: The Power of Words, Rules and Money (pp. 1?38). Cambridge University Press. https://doi.org/10.1017/CBO9781139795357.002