J.  López-Alvarado, Crespo, M. B., Garcia-Jacas, N., Alonso, M. A., Vilar, L., Cristóbal, J. C., Susanna, A., Martínez-Flores, F., Juan, A., and Sáez, L., ?First record of the alien pest Rhaponticum repens (Compositae) in the Iberian Peninsula.?, Collectanea Botanica, vol. 30, pp. 59 - 62, 2011.

M.  Galbany-Casals, Garcia-Jacas, N., and Susanna, A., ?Phylogenetic relationships in the Mediterranean Helichrysum (Asteraceae, Gnaphalieae) based on nuclear rDNA ITS sequence data?, Australian Systematic Botany, vol. 17, 2004.

A.  Susanna, Garcia-Jacas, N., Soltis, D. E., and Soltis, P. S., ?Phylogenetic relationships in tribe Cardueae (Asteraceae) based on ITS sequences?, Amer. J. Bot, vol. 82, pp. 1056 - 1068, 1995.

O.  Hidalgo, Garcia-Jacas, N., Garnatje, T., and Susanna, A., ?Phylogeny of Rhaponticum (Asteraceae, Cardueae_Centaureinae) and related genera inferred from nuclear and chloroplast DNA sequence data: taxonomic and biogeographic implications?, Annals of Botany, vol. 97, no. 5, pp. 705 - 714, 2006.