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Population and Economics 2(4): 85-135
doi:
10.3897/popecon.2.e36061
Published:
28 Dec 2018
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Author
Zarina Kazbekova 
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The Lomonosov Moscow State University, Russia
Conflict of interest
The author has declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.