Proceedings of Yerevan State University
Proceedings of Yerevan State University 1980 #3 (145)
Proceedings of Yerevan State University 1980 #3 (145)

Proceedings of Yerevan State University 1980 #2 (144)
Proceedings of Yerevan State University 1980 #2 (144)

Proceedings of Yerevan State University 1980 #1 (143)
Proceedings of Yerevan State University 1980 #1 (143)

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