?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Alarc%C3%B3n+%C3%81lvarez%2C+Enrique&rft.aulast=Alarc%C3%B3n+%C3%81lvarez&rft.aufirst=Enrique&rft.title=Revista+de+Obras+P%C3%BAblicas&rft.atitle=El+coeficiente+de+impacto+en+puentes+de+ferrocarril&rft.date=September+1971&rft.issn=0034-8619&rft.pages=689-704&rft.issue=3077&rft.volume=118&rft.genre=article