Sustainable and successful collaboration on the editing of scientific work with a great customer, talented scientist and responsible person. In collaboration, every moment was at a high professional level - untouched communication, clearly described tasks, a convenient format for editing and full understanding. Thank you very much, Vladimir, for the trust, the offer of interesting and responsible work on the PhD theses! I wish you success on the defence and further scientific and professional activities! Always at your service in case of need.