1. Regulation (EC), no. 715/2009. Conditions of access to the natural gas transmission networks and repealing Regulation (EC) no. 1775/2005. Official J Eur Union (Legislation Series) 211; 2009. p. 36–54.
2. ACER (Agency for the Cooperation of Energy Regulators). Framework guidelines on rules regarding harmonised transmission tariff structures for gas. Tech. Rep. FG-2013-G-01, Ljubljana, Slovenia; 2013.
3. ENTSOG (European Network of Transmission System Operators for Gas). Network code on harmonised transmission tariff structures for gas. Tech. Rep. TAR0500-15, Brussels, Belgium; July 2015.
4. European Commission. Network code on harmonised transmission tariff structures for gas. Tech. rep., Brussels, Belgium; February 2016.
5. National Grid. Overview of gas transmission charging. Tech. rep.; 2011