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Hyunchul Ahn and  William X. S. Wong,  Multiclass Support Vector Machines with Simultaneous Multi-Factors Optimization for Corporate Credit Ratings.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. April 2016, vol. 112(4). 756 - 760[viewed 20 September 2018]. Available from: http://waset.org/publications/10004243.