https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AUniversidad%20Gerardo%20Barrios%20and%20su-geo%3AMERCADEO%20and%20au%3ATorres%20Alfaro%2C%20Yanira%20del%20Carmen%20and%20holdingbranch%3AUSU%20and%20su-to%3ATESIS%20and%20holdingbranch%3AUSU%20and%20au%3AHern%C3%83%C2%A1ndez%20Pineda%2C%20Erasmo%20de%20Jes%C3%83%C2%BAs&format=rss2 Search results for 'Provider:Universidad Gerardo Barrios and su-geo:MERCADEO and au:Torres Alfaro, Yanira del Carmen and holdingbranch:USU and su-to:TESIS and holdingbranch:USU and au:Hernández Pineda, Erasmo de Jesús' at Biblioteca UGB 0 20