Sound system equipment - Part 11: Application of connectors for the interconnection of sound system components (IEC 60268-11:1987 + A1:1989 + A2:1991); German version HD 483.11 S3:1993
Connectors for frequencies below 3 MHz for use with printed boards - Part 11: Detail specification for concentric connectors (dimensions for free connectors and fixed connectors) (IEC 60603-11:1992)