Hassanien, A., A. S. Elkader, A. B. Gershman, and K. M. Wong,
"Methods of Sensor Array and Multichannel Processing-Convex Optimization Based Beam-Space Preprocessing With Improved Robustness Against Out-of-Sector Sources",
IEEE Transactions on Signal Processing, vol. 54, no. 5: New York, NY: Institute of Electrical and Electronics Engineers, c1991-, pp. 1587–1595, 2006.
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