1. EUR-Lex: EUR-Lex - 32016R0679 - EN - EUR-Lex https://eur-lex.europa.eu/eli/reg/2016/679/oj EUR-Lex: EUR-Lex - 32016R0679 - EN - EUR-Lex https://eur-lex.europa.eu/eli/reg/2016/679/oj
2. Once Only Principle https://ec.europa.eu/cefdigital/wiki/cefdigital/wiki/display/CEFDIGITAL/Once+Only+Principle Once Only Principle https://ec.europa.eu/cefdigital/wiki/cefdigital/wiki/display/CEFDIGITAL/Once+Only+Principle
3. Tarmo Kalvet , Maarja Toots , Robert Krimmer : Contributing to a digital single market for Europe: barriers and drivers of an EU-wide once-only principle. Digit. Gov. Res. Gov. Data Age . 1–8 ( 2018 ). https://doi.org/10.1145/3209281.3209344 10.1145/3209281.3209344 Tarmo Kalvet, Maarja Toots, Robert Krimmer: Contributing to a digital single market for Europe: barriers and drivers of an EU-wide once-only principle. Digit. Gov. Res. Gov. Data Age. 1–8 (2018). https://doi.org/10.1145/3209281.3209344
4. Gerontas , A. : Towards an e-Government semantic interoperability assessment framework . In: Proceedings of the 13th International Conference on Theory and Practice of Electronic Governance. pp. 767– 774 . Association for Computing Machinery, New York, NY, USA (2020) Gerontas, A.: Towards an e-Government semantic interoperability assessment framework. In: Proceedings of the 13th International Conference on Theory and Practice of Electronic Governance. pp. 767–774. Association for Computing Machinery, New York, NY, USA (2020)
5. Robert Krimmer , Tarmo Kalvet , Maarja Toots , Aleksandrs Cepilovs , Efthimios Tambouris: Exploring and Demonstrating the Once-Only Principle: A European Perspective. Digit. Gov. Res. 54 6– 551 ( 2017 ). https://doi.org/10.1145/3085228.3085235 10.1145/3085228.3085235 Robert Krimmer, Tarmo Kalvet, Maarja Toots, Aleksandrs Cepilovs, Efthimios Tambouris: Exploring and Demonstrating the Once-Only Principle: A European Perspective. Digit. Gov. Res. 546–551 (2017). https://doi.org/10.1145/3085228.3085235