Professor A.G. Kyurkchan is the head of the Department of Probability Theory and Applied Mathematics of the Moscow Technical University of Communication and Informatics, and he is a leading researcher at the Institute of Radio Engineering and Electronics, the Russian Academy of Sciences, Fryazino Branch. His research area is mathematical modelling in diffraction theory. Since 1994 he has been the project manager on grants of the Russian Fund of Basic Researches. He has published 137 articles in international scientific journals. His monograph "Analytical Properties of Wave Fields" was published in 1990. N.I. Smirnova is an associate professor in the Department of Probability Theory and Applied Mathematics at the Moscow Technical University of Communication and Informatics. Her research area is mathematical modeling in diffraction theory. She has published 10 articles in international scientific journals.