@article{Trappmann2013,
author = {Trappmann, M. and Beste, J. and Bethmann, A. and Müller, G.},
title= {The PASS panel survey after six waves},
year = {2013},
doi = {10.1007/s12651-013-0150-1},
volume = {46},
number = {4},
pages = {275--281},
}