Lelesz, J. Éva; József Csajbók. The Changes of the Purple coneflower’s (Echinacea Purpurea L.) Herb and Radix Drug Yield under Different Fertilization Conditions. Acta agrar. Debr. 2019, No. 1, 79-83. https://doi.org/10.34101/actaagrar/1/2375.