H. Astibia, “Fossil associations from the middle and upper Eocene strata of the Pamplona Basin and surrounding areas (Navarre, western Pyrenees)”, JIGE, vol. 42, no. 1, pp. 7–28, Apr. 2016, doi: https://doi.org/10.5209/rev_JIGE.2016.v42.n1.51601