?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Sevost%E2%80%99yanov%2C+%D0%95.+%D0%90.&rft.aulast=Sevost%E2%80%99yanov&rft.aufirst=%D0%95.+%D0%90.&rft.issue=9&rft.volume=90&rft.date=2011&rft.issn=0001-4346&rft.atitle=On+Quasilinear+Beltrami-Type+Equations+with+Degeneration&rft.title=Mathematical+Notes&rft.pages=431-438&rft.genre=article