S. Markovich, S. Gannot and I. Cohen, “Multichannel Eigen Space Beamforming in a Reverberant Noisy Environment with Multiple Interfering Speech Signals,” IEEE Transactions on Audio, Speech, and Language Processing, Vol. 17, No. 6, 2009, pp. 1071-1086. doi:10.1109/TASL.2009.2016395
 M. A. Dmour and M. Davies “A New Framework for Underdetermined Speech Extraction Using Mixture of Beamformers,” IEEE Transactions on Audio, Speech, and Language Processing, Vol. 19, No. 3, 2011, pp. 445-457. doi:10.1109/TASL.2010.2049514
 V. G. Reju, S. N. Koh and I. Y. Soon, “Underdetermined Convolutive Blind Source Separation via Time-Frequency Masking,” IEEE Transactions on Audio, Speech, and Language Processing, Vol. 18, No. 1, 2010, pp. 101-116. doi:10.1109/TASL.2009.2024380
 J. Freudenberger and S. Stenzel, “Time-Frequency Masking for Convolutive and Noisy Mixtures,” Workshop on Hands-Free Speech Communication and Microphone Arrays, 2011, pp. 104-108. doi:10.1109/HSCMA.2011.5942374
 J. Cermak, S. Araki, H. Sawada and S. Makino, “Blind Speech Separation by Combining Beamformers and a Time Frequency Binary Mask,” IEEE International Conference on Acoustics, Speech and Signal Processing, Honolulu, 2007, pp. I-145-I-148.
 E. A. P. Habets, J. Benesty, I. Cohen, S. Gannot and J. Dmochowski, “New Insights into the MVDR Beamformer in Room Acoustics,” IEEE Transactions on Audio, Speech, and Language Processing, 2010, pp. 158-170. doi:10.1109/TASL.2009.2024731
 L. Griffiths and C. Jim, “An Alternative Approach to Linearly Constrained Adaptive Beamforming,” IEEE Transactions on Antennas and Propagation, Vol. 30, No. 1, 1982, pp. 27-34. doi:10.1109/TAP.1982.1142739
 A. Spriet, M. Moonen and J. Wouters, “Spatially Pre-Processed Speech Distortion Weighted Multi-Channel Wiener Filtering for Noise Reduction,” Signal Processing, Vol. 84, No. 12, 2004, pp. 2367-2387. doi:10.1016/j.sigpro.2004.07.028
 S. Makino, H. Sawada, R. Mukai and S. Araki, “Blind Source Separation of Convolutive Mixtures of Speech in Frequency Domain,” IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, No. 7, 2005, pp. 1640-1655. doi:10.1093/ietfec/e88-a.7.1640
 A. Sarmiento, I. Durán-Díaz, S. Cruces and P. Aguilera, “Generalized Method for Solving the Permutation Problem in Frequency-Domain Blind Source Separation of Convolved Speech Signals,” Interspeech, 2011, pp. 565-568.
 R. Mazur and A. Mertins, “A Sparsity Based Criterion for Solving the Permutation Ambiguity in Convolutive Blind Source Separation,” IEEE International Conference on Acoustics, Speech and Signal Processing, Prague Czech Republic, 2011, pp. 1996-1999. doi:10.1109/ICASSP.2011.5946902
 H. Sawada, R. Mukai, S. Araki and S. Makino, “A Robust and Precise Method for Solving the Permutation Problem of Frequency-Domain Blind Source Separation,” IEEE Transactions on Speech and Audio Processing, Vol. 12, No. 5, 2004, pp. 530-538. doi:10.1109/TSA.2004.832994
 A. Jourjine, S. Rickard and O. Yilmaz, “Blind Separation of Disjoint Orthogonal Signals: Demixing n Sources from 2 Mixtures,” IEEE International Conference on Acoustics, Speech, and Signal Processing, Vol. 5, 2000, pp. 2985-2988. doi:10.1109/ICASSP.2000.861162
 M. S. Pedersen, D. L. Wang, J. Larsen and U. Kjems “Two-Microphone Separation of Speech Mixtures,” IEEE Transactions on Neural Networks, Vol. 19, No. 3, 2008, pp. 475-492. doi:10.1109/TNN.2007.911740
 D. L. Wang, “On Ideal Binary Mask as the Computational Goal of Auditory Scene Analysis,” Speech Separation by Humans and Machines, Springer, Berlin, 2005, pp. 181-197. doi:10.1007/0-387-22794-6_12
 I. Jafari, R. Togneri and S. Nordholm, “Review of Multi-Channel Source Separation in Realistic Environments,” 13th Australasian International Conference on Speech Science and Technology, Melbourne, 14-16 December 2010, pp. 201-204.
 S. Araki and T. Nakatani, “Hybrid Approach for Multichannel Source Separation Combining Time Frequency Mask with Multi-Channel Wiener Filter,” IEEE International Conference on Acoustics, Speech and Signal Processing, Prague, 22-27 May 2011, pp. 225-228. doi:10.1109/ICASSP.2011.5946381