https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3A%5Bs.n.%5D%20and%20itype%3ATESIS%20and%20au%3AHern%C3%83%C2%A1ndez%2C%20Elmer%20Jos%C3%83%C2%A9%20Ren%C3%83%C2%A9&format=rss2 Search results for 'Provider:[s.n.] and itype:TESIS and au:Hernández, Elmer José René' at Biblioteca UGB 0 20