“…Most researchers explore the impact of liberalization either on gas prices, e.g. Slaba, Gapko and Klimesova (2013), Kratena (2004, 2011), Brau, Doronzo, Fiorio and Florio (2010, or on security of supply, like Joskow (2005), Wright (2005), von Hirschhausen (2008, Pollitt (2008).Others provide case studies of a single country's liberalization process, e.g. Stern (1997) in Great Britain, García (2006 in Spain, Cetin and Oguz (2007) in Turkey, Słupik (2012) in Poland.…”