S. Andrés-Sánchez, M. M. Martínez-Ortega, and E. Rico, “Chorological study of the genus "Filago" L. (‘Asteraceae, Gnaphalieae’) in the Iberian Peninsula and Balearic Islands”, Bot. complut., vol. 37, pp. 57–78, May 2013, doi: 10.5209/rev_BOCM.2013.v37.42270.