Supported by the National Natural Science Foundation of China under Grant No.60083007 (国家自然科学基金); the National Grand Fundamental Research 973 Program of China under Grant No.G1999035810 (国家重点基础研究发展规划(973))
卿斯汉.电子商务协议中的可信第三方角色.软件学报,2003,14(11):1936-1943
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