6Hippel E V. Get new products from customers [ J ]. Harvard Business Review, 1982,60(2): 117- 122.
7Sara B,.Bodil S. The role of service guarantees in service development [ J ]. The Service Industries Journal,2004,24(4) : 1 - 20.
8Annika S, Andreas W. Managing and organizing for innovation in service finns: A literature review with annotated bibliography [ R ]. VINNOVA Report, 2009.