20210206224600.0 BiB working paper. 2196-9574 BiB working paper BiB working paper. 2196-9574 2196-9574 BiB working paper http://www.bib-demografie.de/DE/Veroeffentlichungen/WorkingPaper/working%5Fpaper%5Fnode.html 2196-9574 Germany 2196-9574