Valdés Blanco-Rajoy, Rosario. “Strongholds of the Ribeira Sacra in the Area Surrounding the Monastery of Santo Estevo de Ribas de Sil”. Madrygal. Revista de Estudios Gallegos, vol. 23, Dec. 2020, pp. 375-99, https://doi.org/10.5209/madr.73078.