Natural Gas News Novinite: South Stream Co Seeks to Assuage Eco Concerns in Bulgaria Feb 6, 2013 8:18:am
Natural Gas News RIA Novosti: US to Share with Ukraine Shale Gas Production Technologies Feb 6, 2013 7:19:am
Natural Gas News Voice of Russia: Bulgaria wants safe technology to explore shale gas reserves Feb 6, 2013 7:06:am