9Weill,P. The Relationship between Investment in InformationTechnology and Firm Performance: A Study of the ValveManufacturing Sector [J]. Information Systems Research, 1992, 3(4):307-333.
10AndreasL Nicolaou. 2004. Firm Performance Effects in Relationto the Implementation and Use of Enterprise Resource Planning Systems[j]. Journal of Information Systems, 2004,18(2): 79 - 105.