@TechReport{economics.dp.2007-3,
 author = {Williamson, Oliver E.},
 title = {Transaction Cost Economics: An Introduction},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2007},
 number = {2007-3},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2007-3}
}