PUIA, Ioan, and Attila T. SZABO. “Experimental Cultivation of a New Forage Species - Silphium Perfoliatum L. - in the Agrobotanical Garden from Cluj-Napoca”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca 15, no. 1 (August 5, 1985): 15–20. Accessed March 29, 2024. https://notulaebotanicae.ro/index.php/nbha/article/view/201.