• 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 https://www.scopus.com/sourceid/25674 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109811711&origin=inward&txGid=608dc479c1e6629f38465c055998f60a https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LECT%20NOTES%20ARTIF%20INT&year=2005 https://www.webofscience.com/wos/woscc/full-record/WOS:000894547800005
• 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 https://www.scopus.com/sourceid/25674 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109822005&origin=inward&txGid=43c0b78e07c74b81a9a2f4f80a0a03fa https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LECT%20NOTES%20ARTIF%20INT&year=2005 https://www.webofscience.com/wos/woscc/full-record/WOS:000894547800003
• 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 https://www.scopus.com/sourceid/25674 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109975251&origin=inward&txGid=f4314ce46a597022e2cd768e3b6023c2 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LECT%20NOTES%20ARTIF%20INT&year=2005
• 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 https://www.scopus.com/sourceid/25674 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109868228&origin=inward&txGid=55fe1e62548dab29a2dea331336ab2b6 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LECT%20NOTES%20ARTIF%20INT&year=2005 https://www.webofscience.com/wos/woscc/full-record/WOS:000894547800014
• 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 https://www.scopus.com/sourceid/25674 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109977228&origin=inward&txGid=1443347572a4d79cb5ea10d86235e123 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LECT%20NOTES%20ARTIF%20INT&year=2005 https://www.webofscience.com/wos/woscc/full-record/WOS:000894547800010
• 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 https://www.scopus.com/sourceid/25674 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109896344&origin=inward&txGid=867c458ec87332c7317bf335bf26250c https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LECT%20NOTES%20ARTIF%20INT&year=2005 https://www.webofscience.com/wos/woscc/full-record/WOS:000894547800009