1. ASTM C384-98, Standard test method for impedance and absorption of acoustical materials by the impedance tube method
2. ASTM E1050-90, Standard Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones, and a Digital Frequency Analysis System
3. Test procedure and user interface for determination of the acoustic properties of materials using the two-microphone transfer function method;Rue;Build Acoust,2000
4. Method to resolve microphone and sample location errors in the two-microphone duct measurement method;Katz;J Acoust Soc Am,2000
5. Transfer function technique for impedance and absorption measurements in an impedance tube using a single microphone;Chu;J Acoust Soc Am,1986