Klüsener, Sebastian, et al. “Towards an Integrated Understanding of Demographic Change and Its Spatio-Temporal Dimensions: Concepts, Data Needs and Case Studies”. DIE ERDE – Journal of the Geographical Society of Berlin, vol. 143, no. 1-2, Sept. 2012, pp. 75-104, https://www.die-erde.org/index.php/die-erde/article/view/24.