Shunaev, Sergey, <em>Smolensk branch of National Research University "MPEI"</em><textarea id="BFI_DATA" style="width: 1px; height: 1px; display: none;"></textarea> <div id="WidgetFloaterPanels" class="LTRStyle" style="display: none; text-align: left; direction: ltr; visib, Russian Federation