Peta Darke, Graeme G. Shanks: Stakeholder Viewpoints in Requirements Definition: A Framework for Understanding Viewpoint Development Approaches.
88-105
Roel Wieringa, Gunter Saake: Formal Analysis of the Shlaer-Mellor Method: Towards a Toolkit of Formal and Informal Requirements Specification Techniques.
106-131
Geoff Mullery: The Perfect Requirement Myth.
132-134