?url_ver=Z39.88-2004&rft_id=10.1177%2F0020294020964236&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=G.E.M.&rft.au=Abro%2C+G.E.M.&rft.aulast=Abro&rft.atitle=Effects+of+unmodelled+dynamic+factors+on+an+under-actuated+quadrotor%3A+A+review+of+hybrid+observer+design+methods&rft.pages=1978-1987&rft.issue=9-10&rft.volume=53&rft.issn=00202940&rft.date=2020&rft.title=Measurement+and+Control+(United+Kingdom)&rft.genre=article