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2. Verification of form tolerances, Part II. Cylindricity and straightness of a median line;Carr;Prec. Eng.,1995
3. EN 13005. Guide to the expression of uncertainty in measurement; 1998.
4. EN ISO 14660-1, 2. Geometrical product specifications (GPS)–geometrical features: Part 1. General terms and definitions: Part 2. Extracted median line of a cylinder and a cone, extracted median surface, local size of an extracted feature. 1999.
5. Garmer M. Bewertung typischer Rundheitsabweichungen bei der Gestaltprüfung von Werkstücken durch Fuzzygestützte Klassifikation. Erlangen, Universität Erlangen-Nürnberg, PhD thesis, 1995.