Григоришин, Є. В. 2017. “Germination and Germination Energy of Pale Purple Coneflower (Echinacea pallida(Nutt.) Nutt.) Depending on the Influence of Stimulants”. Scientific Progress & Innovations, no. 3 (September), 126-32. https://doi.org/10.31210/visnyk2017.03.29.