Proceedings of Yerevan State University
Proceedings of the YSU, Series Geology and Geography  2012  #3(229)
Proceedings of the YSU, Series Geology and Geography 2012 #3(229)

Proceedings of the YSU, Chemistry and Biology 2012 #3(229)
Proceedings of the YSU, Chemistry and Biology 2012 #3(229)

Proceedings of the YSU, Physical and Mathematical Sciences 2012 #3(229)
Proceedings of the YSU, Physical and Mathematical Sciences 2012 #3(229)

Proceedings of the YSU, Series Geology and Geography  2012  #2(228)
Proceedings of the YSU, Series Geology and Geography 2012 #2(228)

Proceedings of the YSU, Series Chemistry and Biology 2012 #2(228)
Proceedings of the YSU, Series Chemistry and Biology 2012 #2(228)

Proceedings of the YSU, Physical and Mathematical Sciences  2012 #2(228)
Proceedings of the YSU, Physical and Mathematical Sciences 2012 #2(228)

Proceedings of the YSU, Series Geology and Geography  2012 #1(227)
Proceedings of the YSU, Series Geology and Geography 2012 #1(227)

Proceedings of the YSU, Series Chemistry and Biology 2012 #1(227)
Proceedings of the YSU, Series Chemistry and Biology 2012 #1(227)

Proceedings of the YSU, Physical and Mathematical Sciences  2012 #1(227)
Proceedings of the YSU, Physical and Mathematical Sciences 2012 #1(227)

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