Nuradeen Fethalla Maarouf Saad Hannah Michalska Jawhar Ghommam Robust tracking control for a quadrotor UAV. 1269-1274 2017 MED https://doi.org/10.1109/MED.2017.7984292 conf/med/2017 db/conf/med/med2017.html#FethallaSMG17