The internal gas market I. 

Mandatory literature: 

Buchan, D.; Keay, M. (2015): Europe´s Long Energy Journey: Towards an Energy Union? 32-62. 

IEA: European Union 2020 - Energy Policy Review, 237-265

You may find useful: 

Toplensky, R.(2018): Russia’s Gazprom dodges fine in EU antitrust settlement. https://www.ft.com/content/02a15d08-5f3f-11e8-9334-2218e7146b04 

Stern, J.; Yafimava, K.(2017): The EU Competition investigation of Gazprom’s sales in central and eastern Europe: a detailed analysis of the commitments and the way forward. https://www.oxfordenergy.org/wpcms/wp-content/uploads/2017/07/The-EU-Competition-investigation-of-Gazproms-sales-in-central-and-eastern-Europe-a-detailed-analysis-of-the-commitments-and-the-way-forward-NG-121.pdf?v=928568b84963