ETSI TR 101 873-3-2001 Methods for Testing and Specification (MTS); The Tree and Tabular Combined Notation Version 3; Part 3: TTCN-3 Graphical Presentation Format (GFT) V1.1.2
2002ETSI TR 101 873-3-2002 Methods for Testing and Specification (MTS); The Testing and Test Control Notation Version 3; Part 3: TTCN-3 Graphical Presentation Format (GFT) (V1.2.1)
2001ETSI TR 101 873-3-2001 Methods for Testing and Specification (MTS); The Tree and Tabular Combined Notation Version 3; Part 3: TTCN-3 Graphical Presentation Format (GFT) V1.1.2