?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.rinp.2020.103734&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Hussein&rft.au=Hussein%2C+A.J.&rft.aufirst=A.J.&rft.date=2021&rft.title=Results+in+Physics&rft.atitle=Universal+dispersion+curves+of+a+planar+waveguide+with+an+exponential+graded-index+guiding+layer+and+a+nonlinear+cladding&rft.volume=20&rft.issn=22113797&rft.genre=article