NF S31-082:1992 ACOUSTICS. THRESHOLD OF HEARING BY AIR CONDUCTION AS A FUCTION OF AGE AND SEX FOR OTOLOGICALLY NORMAL PERSONS. (EUROPEAN STANDARD EN 27029).
2000NF S31-082:2000 Acoustics - Statistical distribution of hearing thresholds as a function of age.
1992NF S31-082:1992 ACOUSTICS. THRESHOLD OF HEARING BY AIR CONDUCTION AS A FUCTION OF AGE AND SEX FOR OTOLOGICALLY NORMAL PERSONS. (EUROPEAN STANDARD EN 27029).