Carsten Schmidt, Robert Krimmer, Thomas J. Lampoltshammer. "When need becomes necessity" - The Single Digital Gateway Regulation and the Once-Only Principle from a European Point of View. In Heiko Roßnagel, Christian H. Schunck, Sebastian Mödersheim, editors, Open Identity Summit 2021, Copenhagen, Denmark, Juni 1-2, 2021. Volume P-312 of LNI, pages 223-228, Gesellschaft für Informatik e.V., 2021. [doi]
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