IEC 61094-1:1992 Measurement Microphones Part 1: Specifications for Laboratory Standard Microphones (Edition 1.0 ; Corrigendum: 02/1993; EN 61094-1: 1994)
2000IEC 61094-1:2000 Measurement microphones - Part 1: Specifications for laboratory standard microphones
1992IEC 61094-1:1992 Measurement Microphones Part 1: Specifications for Laboratory Standard Microphones (Edition 1.0 ; Corrigendum: 02/1993; EN 61094-1: 1994)