Ellanska, N.E., ShcherbakovaТ.О., I.G. Khokhlova, and YunoshevaЕ.Р. “The Microbic Communities and Biological Activity of Rhizosphere Different Species of Echinacea”. Plant Introduction 23 (September 1, 2004): 65-69. Accessed September 17, 2024. http://plantintroduction.org/index.php/pi/article/view/1022.