https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A89%20and%20holdingbranch%3AUGB%20and%20au%3APortillo%20De%20la%20O%2C%20Jos%C3%83%C2%A9%20Rigoberto%20and%20au%3AMart%C3%83%C2%ADnez%20Romero%2C%20Katherine%20Gabriela&format=rss2 Search results for 'an:89 and holdingbranch:UGB and au:Portillo De la O, José Rigoberto and au:Martínez Romero, Katherine Gabriela' at Biblioteca UGB 0 20