http://www.4-traders.com/HERITAGE-OIL-PLC-4008356/news/Heritage-Oil-PLC-Heritage-Announces-Acquisition-of-Common-Shares-in-PetroFrontier-Corp-15579288/

http://www.reuters.com/article/2012/12/06/heritageoil-brief-idUSWLB188420121206

http://www.4-traders.com/HERITAGE-OIL-PLC-4008356/news/Heritage-Oil-PLC-Heritage-Announces-Acquisition-of-Common-Shares-in-PetroFrontier-Corp-15579288/

http://www.iii.co.uk/investment/detail?code=cotn:HOIL.L

 

http://seekingalpha.com/article/318863-petrofrontier-sitting-on-27-billion-barrels-of-prospective-oil-resource