Kolisnyk, L.M., and S.V. Klymenko. 2011. “Quantitative Morphological Signs and Variability of the Vegetative and Generative Organs of Elderberry (Sambucus Nigra L.) in the Forest-Steppe of Ukraine”. Plant Introduction 52 (December), 19-24. https://doi.org/10.5281/zenodo.2544324.