https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3ATrillas.%20and%20holdingbranch%3AUSU%20and%20au%3ALara%20Flores%2C%20El%C3%83%C2%ADas%20and%20su-to%3APERDIDAS%20Y%20GANANCIAS&format=rss2 Search results for 'Provider:Trillas. and holdingbranch:USU and au:Lara Flores, Elías and su-to:PERDIDAS Y GANANCIAS' at Biblioteca UGB 0 20