@article{Wagner2018,
author = {Wagner, M. and Rietz, C. and Kaspar, R. and Janhsen, A. and Geithner, L. and Nelse, M. and Kinne-Wall, C. and Woopen, C. and Zank, S.},
title= {Quality of life of the very old: Survey on quality of life and subjective well-being of the very old in North Rhine Westphalia (NRW80+},
year = {2018},
doi = {10.1007/s00391-017-1217-3},
volume = {51},
number = {2},
pages = {193--199},
}