NF S31-510-2*NF EN ISO 11688-2:2004 Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 2 : introduction to the physics of low-noise design
2004NF S31-510-2*NF EN ISO 11688-2:2004 Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 2 : introduction to the physics of low-noise design