1. Batura, O. (2016). Liberalisation of telecommunications services: Social embedding of the liberalised market as a regulatory challenge, universal service in WTO and EU law. Legal Issues of Services of General Interest.
2. Copenhagen Economics. (2018). Main developments in the postal sector (2013–2016). Study for the European Commission, Directorate-General for Internal Market, Industry, Entrepreneurship and SMEs.
3. De Streel, A., & Peitz, M. (2015). The right to communicate: Redefining universal service obligations in postal and electronic communications markets. CERRE Discussion Paper.
4. European Commission. (1987). Communication from the commission to the council and the European Parliament. Towards a dynamic European Economy—Green Paper on the development of a common market for telecommunications services and equipment, COM(87) 290 final.
5. European Commission. (1992). Communication from the commission. Review of the situation in the telecommunications services sector.