1. MTS; The Testing and Test Control Notation version 3; Part 1: TTCN-3 Core Language, ETSI ES 201 873-1
2. ISO/IEC 9646-3: Tree and Tabular Combined Notation
3. ITU-T Recommendation X.680: Information technology—Abstract Syntax Notation One (ASN.1): Specification of basic notation (2002)
4. OMG Formal Document FORMAL/2001-12-01: The Common Object Request Broker–Architecture and Specification, Version 2.6 (2001)
5. MTS; The Testing and Test Control Notation version 3; Part 5: TTCN-3 Runtime Interface (TRI), ETSI ES 201 873-5