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Vitomir Struc and  Nikola Pavesic,  A Case Study on Appearance Based Feature Extraction Techniques and Their Susceptibility to Image Degradations for the Task of Face Recognition.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2009, vol. 30(6). 1351 - 1359[viewed 23 October 2017]. Available from: http://waset.org/publications/8820.