Ayad Al-MahturiFendy SantosoMatthew A. GarrattSreenatha G. AnavattiNonlinear Altitude Control of a Quadcopter Drone Using Interval Type-2 Fuzzy Logic.236-2412018SSCIhttps://doi.org/10.1109/SSCI.2018.8628836conf/ssci/2018db/conf/ssci/ssci2018.html#Al-MahturiSGA18