Shumilovskikh L. S. Long-term dynamics of the East European forest-steppe ecotone / L. S. Shumilovskikh, E. Novenko, T. Giesecke // Journal of vegetation science. 2018. Vol. 29, № 3. P. 416-426. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000651145