http://biblioteca.ciess.org:8081/cgi-bin/koha/opac-search.pl?q=ccl=au%3ACongreso%20Nacional%20de%20Seguridad.%20Reuni%C3%83%C2%B3n.%20M%C3%83%C2%A9xico%2C%201968&format=rss2 0 20