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Vishnevsky.„Replacement Migration: Is it a solution for Russia?“. EXPERT GROUP MEETING ON POLICY RESPONSES TO POPULATION AGEING AND POPULATION DECLINE /UN/POP/PRA/2000/14 6, 10. United Nations Population Division, Department of Economic and Social Affairs (2000-yil 15-avgust). 2003-yil 25-dekabrda asl nusxadan arxivlangan. Qaraldi: 2008-yil 14-yanvar.
Reuter, Timothy. The New Cambridge medieval history., Fouracre, Paul; McKitterick, Rosamond; Reuter, Timothy; Luscombe, D. E. (David Edward); Riley-Smith, Jonathan, 1938-2016; Abulafia, David, First paperback, Cambridge: Cambridge University Press, 2015 — 497–500-bet. ISBN 9781107449060. OCLC945367493.
Reuter, Timothy. The New Cambridge medieval history., Fouracre, Paul; McKitterick, Rosamond; Reuter, Timothy; Luscombe, D. E. (David Edward); Riley-Smith, Jonathan, 1938-2016; Abulafia, David, First paperback, Cambridge: Cambridge University Press, 2015 — 497–500-bet. ISBN 9781107449060. OCLC945367493.