1. In the vast majority of software contracts there is no outright purchase of the software, nor any traditionally 'signed' agreement;M Perry;Electronic Business Law: Butterworths Lexis,2004
2. BSA cracks down on small companies suspected of software piracy
3. Each pattern is stated as a problem consists of the title, problem statement, context and solution. Christopher Alexander is known for the design of the first Pattern Language for the architectural designs;Christopher Alexander;Pattern Language: Towns, Buildings, Construction,1977
4. Designing Concurrent and Distributed Control Systems;A Aarsten;Communications of the ACM,1996