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 : The TOOP project2021 https://doi.org/10.1007/978-3-030-79851-2 Progress in development of the resonant tunneling diodes as promising compact sources at the THz gap bottomUdal, Andres; Jaanus, Martin; Valušis, Gintaras; Kašalynas, Irmantas; Ikonic, Zoran; Indjin, DraganTHz for CBRN and explosives detection and diagnosis2017 / p. 169-178 http://doi.org/10.1007/978-94-024-1093-8_20 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