[1]
MUNTEAN, L.S., VARBAN, D., MUNTEAN, S., TAMAS, M. and VARBAN, R. 1998. Echinacea species of medicinal use. Notulae Botanicae Horti Agrobotanici Cluj-Napoca. 28, 1 (Aug. 1998), 27-30. DOI:https://doi.org/10.15835/nbha281326.