1. Pearse, T., Oman, P.: Maintainability Measurements on Industrial Source Code Maintenance Activities. In: Proceedings of International Conference of Software Maintenance, Opio (France), pp. 295–303 (1995)
2. Beck, K.: Extreme Programming Explained. Embrace Change. Addison-Wesley, Reading (2000)
3. Fowler, M.: Refactoring. Improving Design of Existing Code. Addison-Wesley, Reading (1999)
4. Lecture Notes in Computer Science;B. Walter,2005
5. The Apache Jakarta Project: Tomcat 5.5.4 (January 2005),
http://jakarta.apache.org/tomcat/index.html