PUIA, I. and SZABO, A.T. 1985. Experimental cultivation of a new forage species - Silphium perfoliatum L. - in the Agrobotanical Garden from Cluj-Napoca. Notulae Botanicae Horti Agrobotanici Cluj-Napoca. 15, 1 (Aug. 1985), 15–20. DOI:https://doi.org/10.15835/nbha151201.