Monteagudo Sánchez-Movellán, F. J., I. Butler Sierra, and F. Bastida Milián. “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, Vol. 18, no. 1, Apr. 2009, pp. 28-41, doi:10.5424/fs/2009181-01048.