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Kamran Turkoglu and  Ugur Ozdemir and  Melike Nikbay and  Elbrous M. Jafarov,  PID Parameter Optimization of an UAV Longitudinal Flight Control System.   journal   = {International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2008, vol. 21(9). 1031 - 1036[viewed 25 June 2018]. Available from: http://waset.org/publications/12521.