?url_ver=Z39.88-2004&rft_id=10.12911%2F22998993%2F108654&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Al-Qadami&rft.au=Al-Qadami%2C+E.H.H.&rft.aufirst=E.H.H.&rft.date=2019&rft.issn=22998993&rft.title=Journal+of+Ecological+Engineering&rft.atitle=Yield+efficiency+evaluation+of+double+slope+solar+stills+connected+with+external+spiral+copper+for+potable+water+production&rft.pages=176-186&rft.volume=20&rft.issue=7&rft.genre=article