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Caihong Sun and  Xizi Zhang,  Learning to Recommend with Negative Ratings Based on Factorization Machine.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 2230 - 2236[viewed 21 June 2018]. Available from: http://waset.org/publications/10007831.