Alternative echinacea growth schemes (Echinacea purpurea Moench.). Bulgarian Journal of Crop Science, [S. l.], v. 56, n. 6, p. 58–62, 2019. Disponível em: https://agriacad.eu/ojs/index.php/bjcs/article/view/2908.. Acesso em: 10 mar. 2026.