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2. H. Cox, “Line Array Performance when the Signal Coherence is Spatially Dependent,” 1973 Journ. Acoust. Soc. of Amer. 54, pp. 1743 – 1746
3. B. S. Gottfried and Joel Weisman, “Introduction to Optimization Theory,” Prentice Hall, Inc., Englewood Cliffs, NJ, 1973.
4. N. L. Owsley, “A Recent Trend in Adaptive Spatial Processing in Sensor Arrays Constrained Adaptation,” in Signal Processing, a NATO Advanced Study Institute, Academic Press, 1973, pp. 591 – 604.