1Johannes Moenius. Information versus product adaptation: the role of standards in trade[ R]. Manuscript, 1999.
2Keith E Maskus, John S Wilson. Quantifying the Impact of Technical Barriers to trade: a framework for analysis[ R]. World Bank, 2001.
3Barry Krissoff, Linda Calvin, Denise Gray. Barriers to Trade in Global Apple Markets [ J] . Fruit and Tree Nuts Situation and Outlook, Economic Research Service. August 1997.