M. Hennecke, T. Ploetz, G. A. Fink, J. Schmalenstroeer, and R. Haeb-Umbach, “A hierarchical approach to unsupervised shape calibration of microphone array networks,”10.1109/SSP.2009.5278589__in IEEE/SP 15th Workshop on Statistical Signal Processing (SSP 2009), 2009, pp. 257–260, doi:10.1109/SSP.2009.5278589 .