A. Kukush, Taras Shevchenko National University of Kyiv, Ukraine A. Kulik, Institute of Mathematics of NASU, Kyiv, Ukraine A. Nakonechniy, Taras Shevchenko National University of Kyiv, Ukraine E. Orsingher, Sapienza University of Rome, Italy E. Spodarev, Ulm University, Germany G. Shevchenko, Taras Shevchenko National University of Kyiv, Ukraine G. Torbin, Dragomanov National Pedagogical University, Kyiv, Ukraine I. Molchanov, Institute of Mathematical Statistics and Actuarial Science, University of Bern, Switzerland I. Norros, VTT Technical Research Centre of Finland, Finland J. Šiaulys, Vilnius University, Lithuania J.M. Corcuera Valverde, Universitat de Barcelona, Spain M. Dozzi, IECN, University of Lorraine, Nancy, France M. Kleptsyna, Université du Maine, Le Mans, France M. Podolskij, Aarhus University, Denmark M. Pratsiovytyi, Dragomanov National Pedagogical University, Kyiv, Ukraine M. Radavičius, Vilnius University, Lithuania M.D. Ruiz-Medina, University of Granada, Spain N. Leonenko, Cardiff University, United Kingdom R. Maiboroda, Taras Shevchenko National University of Kyiv, Ukraine Yu. Kondratiev, Universität Bielefeld, Germany Yu. Kozachenko, Taras Shevchenko National University of Kyiv, Ukraine Ł. Stettner, Polish Academy of Sciences, Warsaw, Poland