https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AEditorial%20Universidad%20Gerardo%20Barrios%2C%20and%20su-to%3AINGENIER%C3%83%C2%8DA%20and%20au%3AMart%C3%83%C2%ADnez%2C%20Ren%C3%83%C2%A9%20Alexander%20and%20itype%3ABK&format=rss2 Search results for 'Provider:Editorial Universidad Gerardo Barrios, and su-to:INGENIERÍA and au:Martínez, René Alexander and itype:BK' at Biblioteca UGB 0 20