Proceedings of Yerevan State University
Proceedings of the YSU, Series Geology and Geography  2009 #3(220)
Proceedings of the YSU, Series Geology and Geography 2009 #3(220)

Proceedings of the YSU, Chemistry and Biology 2009 #3(220)
Proceedings of the YSU, Chemistry and Biology 2009 #3(220)

Proceedings of the YSU, Physical and Mathematical Sciences 2009 #3(220)
Proceedings of the YSU, Physical and Mathematical Sciences 2009 #3(220)

Proceedings of the YSU, Series Geology and Geography  2009  #2(219)
Proceedings of the YSU, Series Geology and Geography 2009 #2(219)

Proceedings of the YSU, Series Chemistry and Biology 2009 #2(219)
Proceedings of the YSU, Series Chemistry and Biology 2009 #2(219)

Proceedings of the YSU, Physical and Mathematical Sciences  2009 #2(219)
Proceedings of the YSU, Physical and Mathematical Sciences 2009 #2(219)

Proceedings of the YSU, Series Geology and Geography  2009 #1(218)
Proceedings of the YSU, Series Geology and Geography 2009 #1(218)

Proceedings of the YSU, Chemistry and Biology 2009  #1(218)
Proceedings of the YSU, Chemistry and Biology 2009 #1(218)

Proceedings of the YSU, Physical and Mathematical Sciences 2009 #1(218)
Proceedings of the YSU, Physical and Mathematical Sciences 2009 #1(218)

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