Proceedings of Yerevan State University
Proceedings of Yerevan State University 1977 #3 (136)
Proceedings of Yerevan State University 1977 #3 (136)

Proceedings of Yerevan State University 1977 #2 (135)
Proceedings of Yerevan State University 1977 #2 (135)

Proceedings of Yerevan State University 1977 #1 (134)
Proceedings of Yerevan State University 1977 #1 (134)

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