Abro, G.E.M. and Asirvadam, V.S. and Bin Mohd Zulkifli, S.A. and Sattar, A. and Kumar, D. and Anwer, A. (2020) Effects of unmodelled dynamic factors on an under-actuated quadrotor: A review of hybrid observer design methods. Measurement and Control (United Kingdom), 53 (9-10). pp. 1978-1987. ISSN 00202940