1. APARSEN D22.1: Persistent identifiers interoperability framework (2012). http://www.alliancepermanentaccess.org/wp-content/uploads/downloads/2012/04/APARSEN-REP-D22-1-01-1_9.pdf
2. APARSEN D22.3: Demonstrator set up and definition of added value services (2013). http://www.alliancepermanentaccess.org/wp-content/uploads/downloads/2014/02/APARSEN-REP-D22_3-01-1_0.pdf
3. D4.1: Conceptual model of interoperability (2013). http://files.figshare.com/1239137/D4.1_Conceptual_Model_of_Interoperability.pdf
4. Bazzanella, B., Bortoli, S., Bouquet, P.: Can persistent identifiers be cool? IJDC 8(1), 14–28 (2013)
5. Bouquet, P., Bazzanella, B., Dow, M., Riestra, R.: DIGOIDUNA FINAL REPORT: Digital Object Identifiers and Unique Author Identifiers to enable services for data quality assessment, provenance and access (2011). http://cordis.europa.eu/fp7/ict/e-infrastructure/docs/digoiduna.pdf