@TechReport{economics.dp.2011-50,
 author = {He, Yuqing},
 title = {Psychophysical Interpretation for Utility Measures},
 type = {Economics Discussion Paper},
 institution = {Kiel Institute for the World Economy},
 year = {2011},
 number = {2011-50},
 url = {http://www.economics-ejournal.org/economics/discussionpapers/2011-50}
}