https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A%2230298%22%20and%20au%3AUrquilla%20P%C3%83%C2%A9rez%2C%20Silvia%20del%20Carmen%20and%20au%3AUrquilla%20P%C3%83%C2%A9rez%2C%20Silvia%20del%20Carmen&format=rss2 Search results for 'an:"30298" and au:Urquilla Pérez, Silvia del Carmen and au:Urquilla Pérez, Silvia del Carmen' at Biblioteca UGB 0 20