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Acknowledgments
We would like to acknowledge the friendship, constructive criticism, encouragement, and pa-
tience of our editor, Prof. C. Balanis, who was waiting for the completion of this book for a
long time. We also express our gratitude to Dr. Lena Gialabouki and Dr. Dimitrios Babas, who
have read the manuscript, proposed improvements, and detected many wording problems. Last
but not least, we would like to thank our wives Angela Sahalos and Zoe Kyriacou for their love,
support, and patience during the writing of this book.
John N. Sahalos and George A. Kyriacou
August 2019
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