ŁADYSZ, Jerzy; GLADKEY, Alexander V. Population ageing research from a geographical perspective - methodological approach. Bulletin of Geography. Socio-economic Series, [S. l.], n. 8, p. 51–63, 2007. DOI: 10.1515/2430. Disponível em: https://apcz.umk.pl/BGSS/article/view/2430. Acesso em: 23 feb. 2025.