1. Bauer , C. & Strasser , A. 1993 An organisation model for Private Communication System Service
2. Berkeley , D. de Hoog , R. & Humphreys , P. 1990 Software Development Project Management: Process and Support
3. A spiral model of software development and enhancement;Boehm;IEEE Computer,1988
4. Low-cost, adaptable tool integration policies for integrated environments;Garlan;SIGSOFT Software Engineering Notes,1990