1. Bauby P (2011) From Rome to Lisbon: SGIs in primary law, in developments. In: Szyszczak E et al (eds) Services of general interest. T.M.C Asser Press, The Hague
2. Bauby P (2013) Unity and diversity of SSGIs in the European Union. In: Neergaard U et al (eds) Social services of general interest in the EU. T.M.C Asser Press, The Hague
3. Davies G (2006) The process and side-effects of harmonisation of European welfare states. Jean Monnet working paper 02/06
4. De Vries SA (2011) Services of general economic interest in the interplay between public and private in Europa after Lisbon: the search for more coherence. Europarättslig Tidskrift Nr 3(2011):462–482
5. Ehlerman CD (1987) The internal market following the single European Act. Common Mark Law Rev 24(3):361–409