@conference{vanderzee1998test, title = {Test Signals for Measuring the Efficiency of Audio Amplifiers}, author = {van der Zee, R. A. R. and van Tuijl, A. J. M}, booktitle = {Audio Engineering Society Convention 104}, month = {May}, year = {1998}, url = {https://www.aes.org/e-lib/browse.cfm?elib=8532} }