Acknowledgment to "Adaptive antenna arrays"

It has been brought to the Editor\´s attention that the article "Adaptive Antenna Arrays" by R. W. Bickmore in the August 1964 issue of IEEE SPECTRUM was based in large measure on material written by D. L. Margerum for a forthcoming book. The Editor regrets that Mr. Margerum, his employer, and the publishers of the book did not receive proper credit, and is pleased to publish the following note from Dr. Bickmore: \´My recent SPECTRUM article "Adaptive Antenna Arrays" was essentially an abridgment of Chapter 7 of the book Microwave Scanning Antennas, Volume II, soon to be published by Academic Press, Inc. This chapter, entitled "Self Phased Arrays," was authored by Mr. D. L. Margerum of Electronic Specialty Company, Los Angeles, Calif. It is sincerely regretted that explicit acknowledgment was not given to Mr. Margerum and Academic Press, and it is a pleasure to do so now.\´