ETSI EG 201 015-1997 Methods for Testing and Specification (MTS); Specification of Protocols and Services; Validation Methodology for Standards Using SDL; Handbook V1.1.1
2012ETSI EG 201 015-2012 Methods for Testing and Specification (MTS); Standards engineering process; A Handbook of validation methods (V2.1.1)
1997ETSI EG 201 015-1997 Methods for Testing and Specification (MTS); Specification of Protocols and Services; Validation Methodology for Standards Using SDL; Handbook V1.1.1