The Problem of Understanding the Manifestations of Ravenstein’s Laws on Migration Processes of Pre-Soviet Russia and Soviet Periods of Russian Science. Mediterr. J. Soc. Sci. [Internet]. 2015 May 8 [cited 2024 Dec. 22];6(3):718. Available from: https://www.richtmann.org/journal/index.php/mjss/article/view/6610