Blind Acoustic Beamforming Based on Generalized Eigenvalue Decomposition
E. Warsitz, R. Haeb-Umbach, IEEE Transactions on Audio, Speech, and Language Processing 15 (2007) 1529–1539.

Acoustic filter-and-sum beamforming by adaptive principal component analysis
E. Warsitz, R. Haeb-Umbach, in: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005), 2005, p. iv/797-iv/800 Vol. 4.