https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A%2219439%22%20and%20au%3AUniversidad%20Doctor%20Andr%C3%83%C2%A9s%20Bello%2C%20and%20au%3AM%C3%83%C2%A9ndez%20Mata%2C%20Iris%20A%C3%83%C2%ADda&format=rss2 Search results for 'an:"19439" and au:Universidad Doctor Andrés Bello, and au:Méndez Mata, Iris Aída' at Biblioteca UGB 0 20