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Electronic Commerce Research and Applications > 2010 > 9 > 2 > 160-170
Electronic Commerce Research and Applications > 2011 > 10 > 2 > 194-202
World Patent Information > 2000 > 22 > 3 > 147-165
Electronic Commerce Research and Applications > 2010 > 9 > 2 > 160-170
Electronic Commerce Research and Applications > 2011 > 10 > 2 > 194-202
World Patent Information > 2000 > 22 > 3 > 147-165