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Golden P.B. Peoples of South Russian Steppes; Noonan Thomas. Why the Vikings First Came to Russia // Jahrbticher fur Geschichte Osteuropas. — 1986. — Vol. 34. — S. 321–348; Martin Janet. Treasure of the Land of Darkness: The Fur Trade and Its Significance for Medieval Russia. — Cambridge: Cambridge University Press, 1986. — P. 5—14.

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