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المؤلفون: Mihkel Viru, Reile Juhanson, Fred Värsi, Indrek Linde, Karl Kiisk, Alar Rokk, Helgi Kolk, Karolin Toompere, Juri Karjagin
المصدر: Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.. 76:377-381