• Co-creation and citizen involvement in social innovation : a comparative case study across 7 EU-countries [Online resource]Voorberg, William; Tummers, Lars; Tõnurist, Piret; Kattel, Rainer; Lember, Veiko2015 http://lipse.org/userfiles/uploads/Research%20Report%20LIPSE%20WP%202_20150128_final%20(1).pdf