Kostikova, V.A., A.A. Kuznetsov, V.I. Troshkina, and A.P. Belanova. 2019. “Morphological and Taxonomic Analysis of the Polymorphic Complex Spiraea Betulifolia ‒ Spiraea Beauverdiana in Russia”. Acta Biologica Sibirica 5 (3), 22-32. https://doi.org/10.14258/abs.v5.i3.6353.