Sadchenko, Olena V.Садченко, Олена ВасилівнаСадченко, Елена Васильевна2022-06-152022-06-152021Visegrad Group: a form of establishment and development of European integration: collective monograph / edited by A. Krysovatyy, T. Shengelia. - Tbilisi: TSU. - 2021.https://dspace.onu.edu.ua/handle/123456789/33088In the post-war period, not only the volume of migration in the world has increased, but its composition has also changed: instead of Europe, countries of Asia, Africa and Latin America have become, and Europe itself has begun to actively accept migrants. At the end of the 19th century, the famous English statistician and demographer W. Farr hypothesized that migrations develop without any definite patterns, like a chaotic Brownian motion. This statement was disputed by his contemporary E. G. Ravenstein, who believed that the general patterns of development of migration processes can be identified.enVisegrad GroupEuropean integrationBook chapter