translation.bs: Bugarska, koja kupuje 98% gasa koji joj je potreban od Gazproma, možda sjedi na 300 milijardi do 1 biliona kubnih metara gasa iz škriljaca, kaže novinska agencija Bloomberg, navodeći procjene bugarskog ministarstva energetike i ekonomije.
translation.en: Bulgaria, which buys 98% of its gas from Gazprom, could be sitting on 300 billion cubic metres to 1 trillion cubic metres of shale gas, Bloomberg news agency said, citing the Bulgarian energy and economy ministry's estimates.