The authors are grateful to D.Sc. in Physics
and Mathematics, Professor L. M. Zubov and
D.Sc. in Engineering, Professor V. P.
Zabrodin for their selfless work in reviewing
the manuscript, valuable advice and
comments that were taken into account when
preparing the final edition of the book. We
express special gratitude to our son Zaur
who inspired us for creating this work and
took up most communications with the
Springer publishing house. We are also
grateful to Candidate of Technical Sciences
Yu. V. Subachev who translated this book.