1. ASME Y14.5.1M-1994. Mathematical definition of dimensioning and tolerancing principles. The American Society of Mechanical Engineers, New York, 1994.
2. ISO/TS 17450:1999. Geometrical product specifications (GPS)—model for geometric specification and verification. International Organization for Standardization, Geneva, 1999.
3. ASME Y14.5M-1994. Dimensioning and tolerancing. The American Society of Mechanical Engineers, New York, 1994.
4. ISO 1101:1983. Technical drawings—Geometrical tolerancing—Tolerances of form, orientation, location and run-out—Generalities, definitions, symbols, indication on drawings. International Organization for Standardization, Geneva, 1983.
5. http://www.ds.dk/isotc213.