1. Pegasus: first steps toward a naturalistic programming language;Knöll,2006
2. Naturalistic types;Knöll,2011
3. Implementation of the Naturalistic Programming Language Pegasus_f;Khaylov,2009
4. Object Oriented Software Engineering: A Use Case Driven Approach;Jacobson,1992
5. Writing Effective Use Cases;Cockburn,2000