?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Daniela&rft.aulast=Ortiz+Guachamin&rft.au=Ortiz+Guachamin%2C+Daniela&rft.inst=E.T.S.+de+Edificaci%C3%B3n+(UPM)+%3Chttps%3A%2F%2Foa.upm.es%2Fview%2Finstitution%2FEdificacion%2F%3E&rft.degree=Master+thesis&rft.title=Directrices+para+la+gesti%C3%B3n+de+seguridad+y+salud+laboral+en+empresas+constructoras+de+Ecuador&rft.date=July+2018&rft.tpages=291