@TechReport{economics.dp.2011-23,
 author = {Persson, Maria},
 title = {From Trade Preferences to Trade Facilitation: Taking Stock of the Issues},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2011},
 number = {2011-23},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2011-23}
}