Mobile Digital Rights Management: Security Requirements and Copy Detection Mechanisms. - Miguel Soriano; Stephan Flake; Jürgen Tacken; Frank Bormann; Joan Tomàs (DEXA Workshops, 2005)

Convergent Online Charging for Context-Aware Mobile Services. - Frank Bormann; Stephan Flake; Jürgen Tacken (AINA Workshops (1), 2007)

Third-Party-Initiated Context-Aware Real-Time Charging and Billing on an Open SOA Platform. - Frank Bormann; Stephan Flake; Jürgen Tacken; Carsten Zoth (AINA Workshops, 2008)

Towards a Policy and Charging Control Architecture for Online Charging. - Frank Bormann; Andre Braun; Stephan Flake; Jürgen Tacken (AINA Workshops, 2009)

Anforderungen an die nutzungsabhängige Abrechnung von Logistikdiensten in der Cloud. - Frank Bormann; Dirk Fischer; Stephan Flake; Jürgen Tacken (GI Jahrestagung (1), 2010)

Obtaining Revenues from User Generated Mobile Services for Sport, Fitness and Health. - Frank Bormann; Stephan Flake; Jürgen Tacken (GI Jahrestagung (1), 2010)