Köke, Sonja and Lange, Andreas (2017). Negotiating Environmental Agreements under Ratification Constraints. Journal of Environmental Economics and Management, Volume 83, pp. 90-106.

Köke, Sonja and Lange, Andreas (2015). The Impact of Domestic Policy Constraints on International Environmental Agreements. In: Political Economy and Instruments of Environmental Politics, CESifo Seminar Series. Editors: Friedrich Schneider, Andrea Kollmann and Johannes Reichl, MIT Press.