1. ASME Y14.5, 2009. Dimensioning and Tolerancing—Engineering Drawing and Related Documentation Practices.
2. ASME Y14.5.1, 1994. Mathematical Definition of Dimensioning and Tolerancing Principles.
3. ASTM B925-08, 2008. Standard Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens.
4. Verification of form tolerances Part I: basic issues, flatness, and straightness;Carr;Precision Engineering,1995
5. Geometric dimensioning and tolerancing (GD&T) versus geometrical product specification (GPS);Cristofolini,2001