F. Navarro, F. Gallego, M. A. Sánchez Anta, M. A. González Zapatero, and J. A. Elena Roselló, “The sclerophyllous thorny communities of Aspargo Albi-Rhamnetum ‘bethurici’ in the Ribadurian subsector”, abm, vol. 12, pp. 209–212, Dec. 1987.