Generic federated OOP architecture (3rd version) : The Once-Only Principle Project [Online resource]Grandry, Eric; Fieten, Sander; Tepandi, Jaak; Täks, Ermo2018 http://toop.eu/sites/default/files/D23_Generic_Federated_OOP_Architecture_3rd_version.pdf

The Once-Only Principle Project : Generic Federated OOP Architecture (2nd version) [Online resource]Grandry, Eric; Brandt, Paul; Dimitriou, Jerry; Fieten, Sander; Rotuna, Carmen; Tepandi, Jaak; Täks, Ermo; Verhoosel, Jack P. C.; Zeginis, Dimitris2018 http://www.toop.eu/sites/default/files/D22_Generic_Federated_OOP_Architecture_Final.pdf

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 Conference proceeding at Scopus Article at Scopus Article at WOS