Proceedings of Yerevan State University
Proceedings of Yerevan State University 1978  #3(139)
Proceedings of Yerevan State University 1978 #3(139)

Proceedings of Yerevan State University 1978 #2 (138)
Proceedings of Yerevan State University 1978 #2 (138)

Proceedings of Yerevan State University 1978 #1 (137)
Proceedings of Yerevan State University 1978 #1 (137)

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