S. Pérez-Díaz, J. A. López-Sáez, M. Ruiz-Alonso, L. Zapata, y D. Abel Schaad, «Holocene history of Taxus baccata in the Basque Mountains (Northern Iberian Peninsula)», Lazaroa, vol. 34, pp. 29–41, dic. 2013, doi: 10.5209/rev_LAZA.2013.v34.n1.41933.