1. V.V. Sazhin, I. Seldinas, and V.B. Sazhin, “Russia’s Hard-to-Recover Reserves and Heavy Oil,” J. Adv. Chem. Chem. Tech. 22(12(92)), 56 (2008) [in Russian].
2. www.expert.ru/ural/2014/37/trudnoizvlekaemyijdohod/
3. www.burneft.ru/archive/issues/2012-08/7
4. www.finmarket.ru/main/article/3469367
5. www.wwf.ru/resources/publ/book/837