1. ISO 3274:1996. Geometrical product specifications (GPS) — Surface texture: Profile method — Nominal characteristics of contact (stylus) instruments.
2. ISO/TR 14638:1995. Geometrical product specifications (GPS) — Master Plan, 1995.
3. ISO 17450-2:2002. Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets, specifications, operators and uncertainties, 2002.
4. ISO 17450-1. Geometrical product specifications (GPS) — General concepts — Part 1: Model for geometrical specification and verification.
5. ISO 14253-1:1998. Geometrical product specifications (GPS) — Inspection by measurement of workpieces and measuring equipment — Part 1: Decision rules for proving conformance or nonconformance with specifications.