Этносы - языки - культуры - межкультурная коммуникация.
Российский университет дружбы народов (РУДН).
2015.
P. 150-155
To survive in hard arid conditions under a pressure of different social-economics issues, human learned how to make an analysis of periodical crisis and catastrophic situations and make adequate protective measures, studying their own mistakes and improving the land management.