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Population and Economics 1(1): 71-88
doi:
10.3897/popecon.1.e36033
Published:
20 Dec 2017
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Author
Vladimir Kozlov 
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Institute of Demography at NRU HSE, 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.