@article{Wagner2007,
author = {Wagner, G.G. and Frick, J. and Schupp, J.},
title= {The German Socio-Economic Panel Study (SOEP): Scope, evolution and enhancements},
year = {2007},
journal = {Schmollers Jahrbuch (Journal of Applied Social Science Studies)},
volume = {127},
number = {1},
pages = {139--169},
}