?url_ver=Z39.88-2004&rft_id=doi%3A10.54203%2Fjceu.2021.2&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Motallebian&rft.aufirst=Mahdi&rft.au=Motallebian%2C+Mahdi&rft.pages=08-14&rft.volume=11&rft.atitle=Evaluating+the+Trend+of+Changes+in+Bed+Sediments+Gradation+over+the+Sistan+River&rft.issue=2&rft.title=Journal+of+Civil+Engineering+and+Urbanism&rft.issn=22520430&rft.date=25+March+2021&rft.genre=article