2013-06-18T06:35:27Zhttp://dspace.ups.edu.ec/oai/requestoai_dchttp://www.openarchives.org/OAI/2.0/oai_dc.xsdhttp://www.openarchives.org/OAI/2.0/oai_dc/rdfhttp://www.openarchives.org/OAI/2.0/rdf.xsdhttp://www.openarchives.org/OAI/2.0/rdf/metshttp://www.loc.gov/standards/mets/mets.xsdhttp://www.loc.gov/METS/