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2. ETSI ES 201 873-1 V2.2.1 (2003-02). Methods for Testing and Specification (MTS); The Testing and Test Control Notation version 3; Part 1: TTCN-3 Core Language. ETSI Standard
3. ETSI ES 201 873-4 V2.2.1 (2003-02). Methods for Testing and Specification (MTS); The Testing and Test Control Notation version 3; Part 4: TTCN-3 Operational Semantics. ETSI Standard
4. ETSI ES 201 873-5 V1.1.1 (2003-02). Methods for Testing and Specification (MTS); The Testing and Test Control Notation version 3; Part 5: TTCN-3 Runtime Interface (TRI). ETSI Standard
5. ETSI ES 201 873-6 V1.1.1 (2003-02). Methods for Testing and Specification (MTS); The Testing and Test Control Notation version 3; Part 6: TTCN-3 Control Interface (TCI). ETSI Standard