Proceedings of Yerevan State University
Proceedings of the YSU, Series Geology and Geography  201 #3(226)
Proceedings of the YSU, Series Geology and Geography 201 #3(226)

Proceedings of the YSU, Chemistry and Biology 2011 #3(226)
Proceedings of the YSU, Chemistry and Biology 2011 #3(226)

Proceedings of the YSU, Physical and Mathematical Sciences  2011 #3(226)
Proceedings of the YSU, Physical and Mathematical Sciences 2011 #3(226)

Proceedings of the YSU, Series Geology and Geography  2011  #2(225)
Proceedings of the YSU, Series Geology and Geography 2011 #2(225)

Proceedings of the YSU, Series Chemistry and Biology 2011 #2(225)
Proceedings of the YSU, Series Chemistry and Biology 2011 #2(225)

Proceedings of the YSU, Physical and Mathematical Sciences 2011 #2(225)
Proceedings of the YSU, Physical and Mathematical Sciences 2011 #2(225)

Proceedings of the YSU, Series Geology and Geography  2011  #1(224)
Proceedings of the YSU, Series Geology and Geography 2011 #1(224)

Proceedings of the YSU, Series Chemistry and Biology 2011 #1(224)
Proceedings of the YSU, Series Chemistry and Biology 2011 #1(224)

Proceedings of the YSU, Physical and Mathematical Sciences  2011 #1(224)
Proceedings of the YSU, Physical and Mathematical Sciences 2011 #1(224)

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