?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Sevost%E2%80%99yanov%2C+%D0%95.+%D0%90.&rft.aulast=Sevost%E2%80%99yanov&rft.aufirst=%D0%95.+%D0%90.&rft.date=2024&rft.title=On+quasilinear+Beltrami+equations+and+tangential+dilatation&rft.genre=proceeding