van den Broek, T., M. Tosi, and E. Grundy. “Offspring and Later-Life Loneliness in Eastern and Western Europe: Nachkommenschaft Und Einsamkeit Im Alter in Ost- Und Westeuropa”. Journal of Family Research, vol. 31, no. 2, Sept. 2019, pp. p. 199-215, doi:10.3224/zff.v31i2.05.