?url_ver=Z39.88-2004&rft_id=10.3390%2Fsym12020293&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Y.&rft.au=Alyousifi%2C+Y.&rft.aulast=Alyousifi&rft.title=Symmetry&rft.issn=20738994&rft.atitle=Predicting+daily+air+pollution+index+based+on+fuzzy+time+series+markov+chain+model&rft.volume=12&rft.date=2020&rft.issue=2&rft.genre=article