- Drivers for and barriers to the cross-border implementation of the once-only principleLeosk, Nele; Põder, Irma; Schmidt, Carsten; Kalvet, Tarmo; Krimmer, Robert JohannesThe once-only principle : The TOOP project2021 / p. 38–60 https://doi.org/10.1007/978-3-030-79851-2_3 Collection metrics at Scopus Article at Scopus Collection metrics at WOS Article at WOS
- The once-only principle : a matter of trustKrimmer, Robert Johannes; Prentza, Andriana; Mamrot, Szymon; Schmidt, CarstenThe once-only principle : The TOOP project2021 / p. 1-8 https://doi.org/10.1007/978-3-030-79851-2_1 Article collection metrics at Scopus Article at Scopus Article collection metrics at WOS Article at WOS
- PrefaceKrimmer, Robert; Prentza, Andriana; Mamrot, SzymonThe once-only principle : The TOOP project2021 / 1 p https://link.springer.com/book/10.1007/978-3-030-79851-2 Article collection metrics at Scopus Article at Scopus Article collection metrics at WOS
- The future of the once-only principle in EuropeKrimmer, Robert Johannes; Prentza, Andriana; Mamrot, Szymon; Schmidt, Carsten; Cepilovs, AleksandrsThe once-only principle : The TOOP project2021 / p. 225–236 https://doi.org/10.1007/978-3-030-79851-2_12 Article collection metrics at Scopus Article at Scopus Article collection metrics at WOS Article at WOS
- The technical challenges in OOP application across the European Union and the TOOP OOP architectureTepandi, Jaak; Rotuna, Carmen; Sellitto, Giovanni Paolo; Fieten, Sander; Prentza, AndrianaThe once-only principle : The TOOP project2021 / p. 141−163 https://doi.org/10.1007/978-3-030-79851-2_8 Collection metrics at Scopus Article at Scopus Collection metrics at WOS Article at WOS
- TOOP trust architectureBoldrin, Luca; Sellitto, Giovanni Paolo; Tepandi, JaakThe once-only principle : The TOOP project2021 / p. 126–140 https://doi.org/10.1007/978-3-030-79851-2_7 Article collection metrics at Scopus Article at Scopus Article collection metrics at WOS Article at WOS