Sotelo Navalpotro, JustoAlgarra Paredes, Ángel2011-09-192011-09-192011-09-19http://hdl.handle.net/10637/3500En: Observatorio medioambiental. 1999. N. 2, pags 311-329. ISSN. 1132-1660application/pdfspopen accessArtículohttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.eshttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es