Tokhtar, V., A. Kurskoy, V. Zelenkova, L. Tokhtar, and T. Petrunova. “Invasive Fraction Flora Analysis in the Southwest of the Central Russian Upland”. Amazonia Investiga, Vol. 7, no. 17, Sept. 2019, pp. 2018-12, https://www.amazoniainvestiga.info/index.php/amazonia/article/view/766.