20210206231100.0 Demographic research (Internet) 1435-9871 2363-7064 http://www.demographic-research.org/default.htm clockss CLOCKSS Archive 1999/2024 2024-03-25 Special to 50 Special to 50 Preserved Max Planck Institute for Demographic Research Demographic Research 1435-9871 2363-7064 2363-7064 Demographic research. Demographic research (Internet) Germany 2363-7064 Demographic research.