SZABO, A. T. (1979) “Wheatgrass variability (Agropyron, sect. Elytrigia) in a native collection from Transylvania. II. Agropyron repens”, Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 10(1), pp. 89–99. doi: 10.15835/nbha101137.