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2. Wikicars.org:
http://wikicars.org/en/Car_accidents
3. Optimal Security: Product line document: Version 0.7 (March 2009)
4. Jacobson, I., Christerson, M., Jonsson, P., Overgaard, G.: Object-Oriented Software Engineering: A Use Case Driven Approach. Addison–Wesley, Reading (1992)
5. Cockburn, A.: Writing Effective Use Cases. Addison–Wesley, Reading (2000)