Skvortsov, A.K. 1999: Willows of Russia and Adjacent Countries. University of Joensuu Faculty of Mathematics and Natural Sciences Report Series. Vol. 39. University of Joensuu.
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| Skvortsov, A.K. 1999: Willows of Russia and Adjacent Countries. University of Joensuu Faculty of Mathematics and Natural Sciences Report Series. Vol. 39. University of Joensuu. |