• 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
• Towards a Cross-Border Reference Architecture for the Once-Only Principle in Europe : An Enterprise Modelling ApproachTepandi, Jaak; Grandry, Eric; Fieten, Sander; Draheim, Dirk; Piho, GunnarThe Practice of Enterprise Modeling : 12th IFIP Working Conference, PoEM 2019,Luxembourg, Luxembourg, November 27–29, 2019 : proceedings2019 / p. 103-117 https://doi.org/10.1007/978-3-030-35151-9_7 https://www.scopus.com/sourceid/17500155101 https://www.scopus.com/record/display.uri?eid=2-s2.0-85076686559&origin=inward&txGid=3aac6a2233d72e9b29b0fb4e59c7f34c https://www.webofscience.com/wos/woscc/full-record/WOS:000611409100007
• “When need becomes necessity” - The single digital gateway regulation and the once-only principle from a European point of view
  Schmidt, Carsten; Krimmer, Robert Johannes; Lampoltshammer, Thomas J.Open Identity Summit 2021: Fachtagung vom 01.-02. Juni 2021 Copenhagen2021 / p. 223-228 https://dl.gi.de/server/api/core/bitstreams/ec03538d-b376-4537-bc0f-aab2936c74f8/content https://www.scopus.com/sourceid/21100229106 https://www.scopus.com/record/display.uri?eid=2-s2.0-85120520994&origin=resultslist&sort=plf-f&src=s&sid=b0dcfb58993e0eeceaf7e845ac02712b&sot=b&sdt=b&s=TITLE-ABS-KEY%28%22%22When+need+becomes+necessity%22+-+The+single+digital+gateway+regulation+and+the+once-only+principle+from+a+European+point+of+view%22%29&sl=144&sessionSearchId=b0dcfb58993e0eeceaf7e845ac02712b&relpos=0