1. A Pattern Language;Alexander,1977
2. American National Standards Institute, 1989. X3.138. Information Resource Dictionary System.
3. Supporting and applying the UML conceptual framework;Atkinson,1998
4. The essence of multilevel metamodelling;Atkinson,2001
5. Processes and products in a multi-level metamodeling architecture;Atkinson;Int. J. Software Eng. Knowledge Eng.,2001