Kavanagh, William. “Identities on the Portuguese-Spanish border: permanence and transformation”. Geopolítica(s). Revista de estudios sobre espacio y poder, vol. 2, vol. 2, no. 1, 2011, pp. 23-50, doi: https://doi.org/10.5209/rev_GEOP.2011.v2.n1.37896.