Senator, S. A., V. M. Vasjukov, S. V. Saksonov, L. A. Novikova, and D. O. Vorontsov. “Alien Species in the Flora of the Middle Volga Region”. KnE Life Sciences, Vol. 4, no. 7, Oct. 2018, pp. 190–196, doi:10.18502/kls.v4i7.3238.