Multimedia Applications, Services and Techniques - ECMAST'99 4th European Conference, Madrid, Spain, May 26-28, 1999, Proceedings Leopold, Helmut Heftet / 1999 / Engelsk
Cyber Attack Information System Erfahrungen und Erkenntnisse aus der IKT-Sicherheitsforschung Leopold, Helmut Innbundet / 2015 / Tysk
Multimedia Transport and Teleservices International COST 237 Workshop, Vienna, Austria, November 13 - 15, 1994. Proceedings Hutchison, David Heftet / 1994 / Engelsk
