Service Provider Implementation of SIP Regarding Security. - Vesselin Tzvetkov; Holger Zuleger (AINA Workshops (1), 2007)

The Impact of Port-Based Address-Sharing on Residential Broadband Access Networks. - Andreas Ripke; Rolf Winter; Marcus Brunner; Jürgen Quittek; Holger Zuleger (GLOBECOM, 2010)