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N. Valliammal and  S.N. Geethalakshmi,  An Optimal Feature Subset Selection for Leaf Analysis.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. February 2012, vol. 62(2). 191 - 196[viewed 19 November 2017]. Available from: http://waset.org/publications/2535.