Proceedings of Yerevan State University

Proceedings of the YSU, Series Geology and Geography 2010 #3(223)	Proceedings of the YSU, Chemistry and Biology 2010 #3(223)	Proceedings of the YSU, Physical and Mathematical Sciences 2010 #3(223)
Proceedings of the YSU, Series Geology and Geography 2010 #2(222)	Proceedings of the YSU, Series Chemistry and Biology 2010 #2(222)	Proceedings of the YSU, Physical and Mathematical Sciences 2010 #2(222)
Proceedings of the YSU, Series Geology and Geography 2010 #1(221)	Proceedings of the YSU, Series Chemistry and Biology 2010 #1(221)	Proceedings of the YSU, Physical and Mathematical Sciences 2010 #1(221)

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