@TechReport{economics.dp.2012-37,
 author = {Kögel, Tomas},
 title = {The Rate of Change of the Social Cost of Carbon and the Social Planner’s Hotelling Rule},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2012},
 number = {2012-37},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2012-37}
}