Salemink v Raad van bestuur van het Uitvoeringsinstituut werknemersverzekeringen, Judgment, Reference for a preliminary ruling, C-347/10

Whether a state was at liberty, based on its sovereign rights and associated jurisdiction over its continental shelf, to treat employees working on that continental shelf differently from those working within the territory of that state.

Whether there was incompatibility with the principle of the freedom of movement for workers, having regard to the fact that an individual lost an advantage he had enjoyed while resident in a state after moving to another state.

Whether that incompatibility might have been mitigated by the fact that an individual was in a position to take out voluntary insurance and avail himself of the possibility of doing so.