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Electronic Commerce Research and Applications > 2015 > 14 > 5 > 351-360
Mathematical and Computer Modelling > 2013 > 58 > 5-6 > 1459-1474
Electronic Commerce Research and Applications > 2015 > 14 > 5 > 351-360
Mathematical and Computer Modelling > 2013 > 58 > 5-6 > 1459-1474