04.02.2014
Source: "Fontanka.ru" newspaper
29.01.2014
Source: "Morvesti.ru" Informational Agency
07.01.2014
Source: "Rossiyskaya Gazeta" newspaper
05.12.2013
Source: "Oil of Russia" Informational and Analytical Portal
29.08.2013
Source: "Rossiyskaya Gazeta" newspaper
02.07.2013
Source: "Moskovskiy Komsomolets" newspaper