Natural Gas News Standart: Bulgaria to export Han Asparuh gas through the South Stream Nov 4, 2013 6:12:pm
Natural Gas News RIA Novosti: Ukraine’s Shale Gas Plans Pose Danger for Russia – WWF Nov 1, 2013 3:43:pm
Natural Gas News Novinite: Gazprom CEO Announces Start of South Stream in Bulgaria Oct 31, 2013 8:08:pm