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Population and Economics 2(3): 70-113
doi:
10.3897/popecon.2.e36056
Published:
12 Oct 2018
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Author
P. Gazizullina 
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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.