en: See Commission Decision in Case N 237/08 — Germany, Broadband support in Niedersachsen.
el: Βλέπε http://www.eftasurv.int/media/state-aid-guidelines/Part-VI---Compensation-granted-for-the-provision-of-services-of-general-economic-interest.pdf (δεν έχει ακόμη δημοσιευθεί).