Cearreta, A., M. Alday, M. J. Irabien, N. Etxebarria, y J. Soto. 2008. «Modern conditions and recent environmental development of the Muskiz estuary: historical disturbance by the largest oil refinery of Spain». Journal of Iberian Geology 34, nº 2:: 191-213. https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0808220191A