@TechReport{economics.dp.2009-20,
 author = {Hufbauer, Gary Clyde  and Kim, Jisun },
 title = {Climate Policy Options and the World Trade Organization},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2009},
 number = {2009-20},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2009-20}
}