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2019
Wagner, Michael 
ORCID: 0000-0003-2589-6440, Kuppler, Matthias ORCID: 0000-0002-7324-4722, Rietz, Christian and Kaspar, Roman
(2019).
Non-response in surveys of very old people.
European Journal of Ageing, 16 (2).
pp. 249-258.
Berlin ; Heidelberg:
Springer.
ISSN 1613-9372
2017
Wagner, Michael ORCID: 0000-0003-2589-6440, Rietz, Christian, Kaspar, Roman, Janhsen, Anna, Geithner, Luise, Neise, Michael, Kinne-Wall, Carolin, Woopen, Christiane ORCID: 0000-0002-7148-6808 and Zank, Susanne
(2017).
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+).
Zeitschrift für Gerontologie und Geriatrie, 51 (2).
pp. 193-199.
Heidelberg:
Springer Medizin.
ISSN 0948-6704