Open Science Research Excellence
Zhang Yan and  Yu Bin,  Non-negative Principal Component Analysis for Face Recognition.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2010, vol. 48(12). 1794 - 1798[viewed 19 March 2019]. Available from: http://waset.org/publications/14158.