@techreport{Wagner2007,
author = {Wagner, G. and Frick, J. and Schupp, J.},
title= {The German Socio-Economic Panel Study (SOEP): Scope, evolution and enhancements},
year = {2007},
publisher = {German Institute for Economic Research},
address = {Berlin},
number = {SOEPpapers on Multidisciplinary Panel Data Research 1},
}