4U.S. Energy Information Adminstration. U.S. Natural Gas Regulatory Authorities[E/OL]. http://www.eia.gov/pub/oil_gas/ namral_gas/analysisA~ublications/ngpipeline/regulatory.html.
5The Federal Energy Regulatory Commission. Cost-of-Service Rates Manual[E/OL]. www.ferc.gov/industries/gas/gen-info/cost- of-service-manul.doc.
6Gazprom gas pipelines[E/OL], http://www.gazprom.com/about/ production/projects/pipelines/.