?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=M.T.&rft.aulast=Ahmad&rft.au=Ahmad%2C+M.T.&rft.volume=22&rft.issn=13115065&rft.issue=4&rft.pages=1662-1675&rft.atitle=Performance+comparison+of+different+machine+learning+algorithms+on+a+time-series+of+covid-19+data%3A+A+case+study+for+Saudi+Arabia&rft.title=Journal+of+Environmental+Protection+and+Ecology&rft.date=2021&rft.genre=article