- Detlef Hühnlein, Heiko Roßnagel, editors, Open Identity Summit 2013, September 9th - 11th 2013, Kloster Banz, Germany. Volume 223 of LNI, GI, 2013.
- Detlef Hühnlein, Heiko Roßnagel, editors, Open Identity Summit 2014, November 4-6, 2014, Stuttgart, Germany. Volume 237 of LNI, GI, 2013.