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B. M. Mohan and  Sanjeeb Kumar Kar,  Orthogonal Functions Approach to LQG Control.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1026 - 1031[viewed 13 December 2017]. Available from: http://waset.org/publications/6618.