"From the review of the first edition in Priroda by V.I. Arnold and Ya.B. Zeldovich: "...For a solid scientific monograph, V.V. Beletsky's book is out of the ordinary in many respects. Without exaggeration we can say that it marks the affirmation of a new style in the scientific literature. The author explains in a frank and detailed manner the reasons behind each calculation, its difficulties, and the psychological side of research....The general impression that the "Essays" make is not that of a boring lesson, but rather a discussion with a brilliant, knowledgeable and wise interlocutor.