Monteagudo Sánchez-Movellán, F.J., Butler Sierra, I. and Bastida Milián, F. 2009. Ecology, reproductive biology and conservation of Picris willkommii (Schultz Bip.) Nyman (Asteraceae): an endemic, protected species from therophytic grasslands of South-Western Iberian Peninsula. Forest Systems. 18, 1 (Apr. 2009), 28-41. DOI:https://doi.org/10.5424/fs/2009181-01048.