Erschienen in: GAL, Cecilia S., ed., Paul B. KANTOR, ed., Michael E. LESK, ed.. Protecting Persons While Protecting the People. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009, pp. 63-81. Lecture Notes in Computer Science. 5661. ISBN 978-3-642-10232-5. Available under: doi: 10.1007/978-3-642-10233-2_7
