<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold" xml:space="preserve">Schmidt, Johannes (2016):</hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Niklas Luhmann´s Card Index: Thinking Tool, Communication Partner, Publication Machine</hi>, in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Alberto Cevolini (ed.): </hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Forgetting Machines. Knowledge Management Evolution in Early Modern Europe</hi>. Leiden: Brill 289-311.