?url_ver=Z39.88-2004&rft_id=10.1002%2Fmma.7271&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Khan%2C+N.A.&rft.aulast=Khan&rft.aufirst=N.A.&rft.date=2021&rft.issn=01704214&rft.atitle=Exploring+fractional+order+2-D+Helmholtz+equation+using+finite+difference+scheme+through+the+bat+optimization+algorithm&rft.title=Mathematical+Methods+in+the+Applied+Sciences&rft.genre=article