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Munjal, ML and Narayana, TSS (2006) A test element reversal method for measurement of acoustic four-pole parameters: theory and experiment. In: NSA 2006, 16-17 Nov 2006, NPL, New Delhi.
Narayana, TSS and Munjal, ML (2005) Prediction and measurement of the four-pole parameters of a muffler including higher order mode effects. In: Noice Control Engineering Journal, 53 (6). pp. 240-246.